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Whether it's in the woods or on the motocross track, one of the critical components that have a significant effect on rideability and traction is your engine’s clutch. The clutch is responsible for transmitting power from the crankshaft to the final drive of your machine. Traditionally, powersports machines are offered with manual transmissions and use wet, dry, or slipper clutches. At Rekluse, we specialize in high-performance clutch solutions that are easily installable into engines traditionally utilizing wet clutches. Auto clutches have inherent advantages over the other clutch types mentioned. Before considering an auto clutch, it’s important to understand all the essential details of what an auto clutch is, how it works, and the numerous benefits that street and dirt riders can expect. Different auto clutch options are available depending on the type of riding and budget, so it’s important to understand which one is right for you. Auto clutches have inherent advantages, but it's important to understand all the critical details to know what's right for you. (RadiusCX cable actuated model configuration shown) What is an auto clutch? An auto clutch is a type of clutch that automatically engages and disengages the based on engine RPM, and ultimately, the power being transmitted to the final drive. The ability to engage and disengage the clutch via rider input through actuation of the clutch lever is retained; however, rider modulation of the clutch isn't necessary in many situations. An auto clutch allows easy starting and stopping without using the clutch lever, and virtually eliminates engine stalling. Unless you have mastered clutchless shifting, the clutch lever is still used when shifting gears. Star Racing Yamaha has utilized Rekluse auto (RadiusCX) and manual (Core Manual TorqDrive) clutches throughout the 2019 and 2020 MX season. Justin Barcia and the Monster Energy / Yamaha Factory Racing Team utilized the RadiusCX auto clutch for select rounds of the 2020 Lucas Oil Pro Motocross Championship. Rekluse auto clutches automatically engage and disengage the clutch based on engine RPM. The option for rider modulation of the clutch via the lever is retained, but unnecessary, except for during shifting. An auto clutch should not be confused with an automatic transmission. Shifting gears is still an essential aspect of riding an auto clutch-equipped machine. An auto clutch is also different than a slipper clutch. When aboard a slipper clutch equipped machine and the throttle is chopped, the clutch disengages. When riding an auto clutch-equipped machine and the throttle is chopped, power transmission to the final drive is maintained, effectively maintaining engine braking. A unique characteristic of Rekluse auto clutches is their ability to retain engine braking when the throttle is chopped. How does an auto clutch work and what is an EXP disk? Centrifugal force is the governing force that allows an auto clutch to work. Centrifugal force is the resulting force that acts on an object rotating around a centerline. The heavier the rotating object or, the faster the object is spinning, the more inertia it will have, and the more force it will exert. An auto clutch features a special clutch disk that is designed to utilize the principle of centrifugal force. The Rekluse clutch disk that gives an auto clutch it’s automatic properties is called an EXP disk. The EXP disk essentially acts as a friction disk that responds to engine speed. The Rekluse EXP disk is the key ingredient to Rekluse's auto clutch formula. It's a friction disk built to respond to the centrifugal force of the spinning engine. The EXP disk is comprised of wedges that are positioned circumferentially around the clutch disk. The wedges are tuned and designed to respond to increases and decreases in engine speed. As engine speed increases, centrifugal force increases, and the wedges in the EXP disk exert an outward force on the two halves of the EXP disk, causing them to expand and the clutch to engage. As engine speed decreases, centrifugal force decreases, and the force exerted by the wedges decreases in the EXP disk, resulting in contraction of the two halves, which causes the clutch to disengage. To ensure the clutch is disengaged at idle, the clutch is set up so that a small gap of about 0.030” exists between the clutch pack and pressure plate. Off idle, as the throttle is applied and engine RPM increases, the EXP disk expands outwards, overcomes the installed gap, and engages the clutch. Since the auto clutch automatically engages at engine speeds higher than idle, the functionality of the clutch lever and traditional clutch deactivation/actuation methods can be retained without any modification. Finally, because an auto clutch works exactly like a standard clutch above idle, features associated with traditional clutch operation such as engine braking are also retained. Depending on your application and the auto clutch package you have, Rekluse has proprietary designs for adjusting installed gap, which is a critical step in optimum auto clutch performance. Advantages of an auto clutch If you’re considering switching to an auto clutch, here’s a few of the advantages and how they’re possible: No Stalling - Since the auto clutch engages and disengages as a function of engine speed and at idle the clutch is set up to be disengaged, stalling is not possible. Tunable - Rekluse EXP disks are tunable. The EXP disk can be tuned to engage at various engine speeds, and how quickly or “hard” the clutch engages can also be manipulated. Dead-on power delivery - An auto clutch simulates perfect clutch modulation which results in better traction. Reduces physical and mental fatigue - Since the utilization of an auto clutch yields fewer situations where the rider needs to engage the clutch, physical fatigue is reduced. Mental fatigue is also reduced since riders no longer need to focus as much on clutch operation. Clutch lever is still operational - If circumstances arise where manual clutch operation is advantageous, this can easily be accomplished. Engine braking is unchanged - Because an auto clutch operates just like a standard clutch above idle speed engine braking is not affected or altered. (RadiusCX DDS for KTM / Husqvarna hydraulic actuated model configuration shown) Who benefits from using an auto clutch? Rekluse auto clutches are designed for numerous applications and offer riders inherent advantages in each of them. There are application-specific advantages that riders can benefit from as well: Motocross - Automatic modulation of the clutch allows riders to ride a taller gear through corners. - The rear brake can be applied fully without fear of stalling. - Ease of operation allows the rider to focus more on their line. Woods - Automatic modulation of the clutch allows for better traction in slippery conditions. - Navigation of technical terrain is easier. - Ease of operation allows the rider to focus on their line. "In the slicker, rockier, rooty-er stuff, I trust RadiusCX [auto clutch] more than my finger." -Ryan Sipes (Photo: Future7Media) Trail - Navigation of technical terrain is easier. - Automatic modulation of the clutch allows for better traction in slippery conditions. - Steep and technical hills can be navigated without worrying about feathering the clutch to keep the RPMs up and the bike running. Zach Bell and the Precision Concepts team races WORCS and other West Coast GPs aboard their RadiusCX equipped KX450s. Rekluse RadiusCX Auto Clutch for the Kawasaki KX450 Adventure Bikes The RadiusX auto clutch covers a wide range of Adventure Bike applications: Photo: Gnarly Routes Yamaha YXZ1000 The Rekluse EXP 3.0 auto clutch for the Yamaha YXZ1000 allows you to operate the manual transmission with ease, with smoother clutch engagement which comes in handy when maneuvering at low speeds in technical terrain. Photo Credit: UTV Action, Cain Smead Auto clutch durability Similar to OEM applications, auto clutch durability depends on the end user and how aggressively they operate their machine. That said, Rekluse auto clutches are designed to last at least as long as OEM clutch applications. Since the clutch is mechanically engaged at the same RPM every time, clutch wear is consistent which helps prolong clutch life. Auto clutch durability also depends on ensuring the clutch is within spec and adjusted correctly. Auto clutch riders need to perform a simple and quick check called “free play gain,” which is a comparative measurement taken at the clutch lever periodically. Why are auto clutches innovative? Rekluse auto clutches are innovative because there are no other clutch solutions on the market that offer significant rider advantages while at the same time retain conventional clutch functionality and ease of use. Innovation doesn’t stop at functionality, the number of installation options and the ease at which an auto clutch can be installed are also worthy attributes, not to mention the fact that no modifications are required to install any of Rekluse’s auto clutches. All Rekluse auto clutch systems are drop-in, no additional modifications are required. Auto clutch options To help you understand how each clutch option differs, the highlights of each clutch are identified below, and a comparison table is presented that also shows key differences. Whether you’re a top-level racer, avid adventure rider, or dedicated trail enthusiast, there is an auto clutch option for you. RadiusCX: $1,049 - $1,179 (Dirt Bike and ATV) - Premier, top of the line auto clutch. - Features all the latest technology offered: EXP, Core, and TorqDrive - Increased friction disk count transfers more power to the rear wheel while eliminating clutch fade. - Provides optimal lever feel. - Yields highest level of durability. - Increased oil circulation through the clutch. (RadiusCX cable actuated model configuration shown) RadiusX: $649 - $749 (Dirt Bike, ATV, ADV, Street) - Excellent mix of performance and cost – uses OEM hub and pressure plate. - Includes TorqDrive and EXP technologies Core EXP 3.0: $949 - $1,079 (Dirt Bike, ATV, YXZ1000) - Core EXP 3.0 uses OEM friction disks, meaning power transfer will be equivalent to stock engine performance. - Includes EXP and Core technologies. - Increased oil circulation through the clutch. Understanding how Rekluse auto clutches work is proof they are an advantageous option over various applications. View Rekluse clutch options for your machine here on the website, or use the dealer locater to find your closest Rekluse dealer. If you have any questions at all regarding which clutch is right for you, installation, or adjustment, Rekluse experts are happy to help and can be contacted at 208-426-0659 or by email at firstname.lastname@example.org. What the pros are saying: Rekluse and Star Racing Yamaha – Clutch Technology for Champions Dylan Ferrandis on Rekluse RadiusCX Auto Clutch Precision Concepts Kawasaki Team Manager Robby Bell on Rekluse Still not sure which clutch is right for you? Check out our complete guide here to help you decide!
Rekluse auto clutches are high-performance clutches that offer riders many benefits ranging from improved control to increased power transmission; however, like any clutch, it is imperative that they are adequately maintained to ensure long clutch life. Rekluse auto clutches are not overly complicated devices, but they do differ from regular clutches, which means they have different maintenance requirements. In this article, we’ll outline auto clutch maintenance inspections and procedures so next time you inspect your clutch, you’ll be confident and ready to tackle the job. For starters, it’s important to note the key difference between a Rekluse auto clutch and a regular clutch. While Rekluse clutches have many performance enhancing benefits, the main difference between an auto clutch and a regular clutch is the incorporation of Rekluse’s EXP disk. In summary, the EXP disk is the mechanism that allows the clutch to engage and disengage automatically as a function of engine RPM. The EXP disk is the key component within a Rekluse auto clutch and is a crucial point for inspections. Don't have an auto clutch for your bike yet? Find one here! The EXP disk is the key component to Rekluse auto clutches and will be part of auto clutch maintenance. Read on for all the key maintenance details. Click here for our complete guide on everything you need to know about the auto clutch! Maintenance items within this article are broken into two categories: regular maintenance, and periodic maintenance. Regular maintenance are the maintenance items that are essential to perform frequently and ensure you get the most out of your clutch. Periodic maintenance are the maintenance items that are important, but occur less frequently. Periodic maintenance tasks require partial disassembly, whereas most regular maintenance items are performed before operating the machine. We'll cover regular maintenance and periodic maintenance, which may require different levels of disassembly. Regular Maintenance Checking Free Play Gain The most important functional check that can be performed to ensure a Rekluse auto clutch performs reliably throughout its life is to check its free play gain. This check should be performed every time before the machine is ridden. Free play gain that is set incorrectly can result in degraded clutch performance and life. Too little free play gain can result in clutch slip and too much free play gain can result in clutch drag. Checking free play gain is a verification method to assess the installed gap. The “installed gap” is a term used to describe the amount of free space between the clutch pack and pressure plate. The free space is critical because it is what allows the clutch to spin freely until the engagement RPM is reached and the EXP disk expands to engage the clutch fully. Free play gain can be checked using two methods, “the rubber band method” and “the hand method.” Comprehensive instructions on how to check and adjust free play gain can be found in the videos below and in the installation manual. A complete collection of Rekluse support videos can be found HERE. Checking free play gain is a standard practice with Rekluse auto clutches and is a key to ensuring long life and proper performance. It can be done with the supplied rubber band at first to build an understanding, then done by hand once the user feels comfortable. Rubber band and hand methods In both procedures, the bike is warmed up, running, and in neutral. The next step is to take play out of the clutch actuation system by squeezing the clutch lever, whether cable or hydraulic so that the pressure plate springs are on the verge of being compressed. The “hand method,” is done by squeezing the lever and feeling for resistance from the pressure plate, and the “rubber band method” is done by wrapping the supplied rubber band around the handlebar and securing it to the clutch lever. The picture below shows the correct way to secure the rubber band. Once the slack is taken out of the clutch system, quickly rev the engine up to 5000 - 7000 RPM (½ to ¾ throttle). The clutch lever should recede toward the handlebar. Observe the amount of clutch lever movement at the end of the clutch lever. The amount the clutch lever moves is the free play gain. Repeat the revving procedure a couple more times to confirm that free play gain is consistent. Be sure to let the engine return all the way to idle before revving the engine again. For most machines, the correct amount of free play gain is ⅛ inch but can be up to ¼” on select machines. Refer to your installation manual for specific free play gain specifications. If the free play gain falls outside of spec, adjustments to the installed gap should be made before riding the machine. For instructions on how to adjust the installed gap, consult the installation manual provided with your auto clutch. Appropriate Oil Using a suitable oil is key to ensuring peak auto clutch performance. Rekluse has recently developed its own line of oils for street and dirt motorcycle applications and has recommendations on alternatives. Learn more about Rekluse Factory Formulated Oils HERE. Dirt Bikes - Rekluse clutch systems are designed to work with OEM recommended oils, specifically those that meet JASO MA or MA2 standards. In-house oil testing has repeatedly shown that clutch performance is maximized with oils explicitly designed for wet-clutch applications. There are some oils Rekluse does NOT recommend which are JASO-MB oils and automotive oils. JASO-MB oils are not designed for wet-clutches, and automotive oils may contain friction modifiers that negatively affect clutch performance. Street Bikes - Rekluse recommends its Factory Formulated Oils, to use the OEM’s recommended oils, or any high-quality primary oil. Break-in Procedure Any time a new Rekluse auto clutch is installed or rebuilt it is imperative to follow the break-in procedure outlined in the installation manual. The break-in procedure is essential for a couple reasons. First, to ensure proper and smooth EXP disk operation, and second, to ensure the clutch components gradually mate to one another. Proper break-in ultimately allows the clutch to create the most friction during engagement and efficiently transfer power to the ground. A series of roll-on starts are used to break-in Rekluse auto clutches. Be sure to follow the break-in procedure outlined in the installation manual that came with your clutch. This is key to performance and durability! Re-check Free Play Gain Once a Rekluse auto clutch has been broken in it is important that the free play gain is re-checked. As parts mate to one another during break-in, it is possible the installed gap will change and require adjustment. Regular Oil Changes Clutch performance and longevity depend on oil quality. Dirty or degraded oil can easily and quickly increase clutch wear rates. To ensure your clutch operates optimally, Rekluse recommends following your machines OEM specified oil change schedule. Periodic Maintenance and Wear Signs In-depth instructions for checking and servicing Rekluse auto clutches can be found within the supplied installation manual as well as online. Generally speaking, aside from the additional checks and inspections of the EXP disk, clutch inspections and servicing tasks are very similar to regular clutches. The Rekluse website has a complete archive of support documents. Click the image above to find support material for your product and application. Periodic maintenance should be performed per the schedule shown below. The “light” usage range is based on an average rider’s moderate use. The “Heavy” inspection range is based on riding in extreme environments or riding conditions. Use this table as a general guideline to maintenance intervals based on riding style and conditions for the maintenance practices below . As always, each person's situation will vary, so be sure to be sure to perform maintenance as necessary. The following information is provided to highlight essential maintenance inspections and to provide an overview of periodic maintenance activities. EXP Disk Inspection Measure the EXP Disk thickness The thickness of the EXP disk should be measured across the friction pads and compared to the specifications provided in the installation manual. Measure the thickness of your EXP disk on the friction pad and compare to the spec in your Rekluse product manual. If measurements are outside of spec, the EXP bases and Teflon pads should be replaced. Test the EXP Wedges From the inside of the EXP disk, push a pair of wedges opposite one another outward. Once fully extended, release the wedges and observe how they retract. The wedges should return smoothly to their original position. With the EXP disk removed from your machine, push the wedges outward, then release. They should return quickly and smoothly. Consider replacing if there is any stiction or notchiness. If any of the wedges stick, the EXP bases and Teflon pads may need to be replaced. EXP Disk Visual Inspections Inspect the EXP tabs that engage with the clutch basket tangs for signs of hammering and deformation. Check that all friction pads bonded to the EXP plates are in place. Ensure the friction pads are not glazed over. They should appear almost black and have a somewhat rough surface. Pads that are glazed over will have a smooth and shiny appearance. If any glazed pads are encountered the EXP base should be replaced. The first photo shows a new friction pad and the second photo shows a worn friction pad. A worn friction pad indicates the EXP bases should be replaced. Check the EXP assembly for discoloration. Discoloration may be a sign that the clutch overheated. If overheating occurred, the bases and wedges may need to be replaced. With the EXP Disk Disassembled Check the ramps in each EXP base. The ramps are the part of the EXP base that engages with the Teflon pads and allows the wedges to slide in and out of the disk assembly. Ramps that have machining marks or are slightly polished are normal. Ramps with indentations or raised burrs are abnormal, and the EXP base should be replaced. Notice the worn out ramps on the EXP base in the first photo versus the ramps on the new EXP base in the second photo. This is a sign it's time to replace the EXP bases. Check the Teflon pads that reside in the wedges. The Teflon pads should be defect free and sit slightly above the wedge pocket. The Teflon pads can sometimes fall out when the EXP disk is disassembled, so be sure that they are all accounted for before reassembly. Any time the EXP bases are replaced, it is highly recommended that the Teflon pads are replaced as well for best performance. The Teflon pads that sit in the wedges are the contact points for the ramps on the EXP bases. These should also be inspected for wear and replaced as necessary, especially when the EXP bases are being replaced! Drive Plate Inspections Check all drive plates for signs of excess heat buildup by looking for discoloration. Drive plates appearing purple, blue, or black can be an indication that excess heat was built up. This example shows what coloring to look for on the drive plates to know if they've been subject to overheating, and if so, how much. Friction Disk Inspection Check all friction disks for signs of glazing. The friction disks will appear black and rough under normal circumstances. Glazed friction disks will appear smooth and shiny once oil is removed from them. Friction pads on new friction plates have a textured surface and are tan in color. If your fiction plates appear dark or black in color and have a smooth, glossy finish, it's time to replace your friction plates. Operation While there are limited operating restrictions associated with Rekluse auto clutches, there are a couple of noteworthy restrictions that should be adhered to. Do not perform 3rd gear starts - starting in 3rd gear will increase the chances of burning up the clutch and significantly decrease its life. For some street applications, it is crucial to maintain a cruise RPM at or above the recommended cruising RPM outlined in the installation manual. For example, cruise RPM for auto clutches installed on Harley-Davidson motorcycles should be above 2200RPM to ensure the EXP disk is fully engaged. This will ensure clutch slippage and excess heat build-up is avoided. Wrap Up This overview of regular and periodic auto clutch maintenance highlights how easy maintaining an auto clutch can be as well as how important doing so is to ensure the clutch performs optimally throughout its life. Regular maintenance boils down to ensuring break-in is performed according to Rekluse’s recommendations, the free-play gain is checked consistently, the proper oil is utilized, and the oil is changed routinely. Periodic maintenance items consist of a couple of measurements, a functionality check, and several visual inspections to ensure all components are in tip-top shape. If you’re ready to increase the performance of your machine, you can find Rekluse clutches via the Rekluse Make/Model finder or dealer locator. Alternatively, Rekluse customer service can be contacted at 208-426-0659 or by email at email@example.com.
Official press release from Rekluse BOISE, Idaho – July 10, 2019 – Monster Energy/Yamalube/Star Racing Yamaha’s Dylan Ferrandis went 1-1 at Red Bud, securing his first overall win of the season. This win is also the first time an auto clutch has been on the top step of a Lucas Oil Pro Motocross podium. Ferrandis and his teammates Colt Nichols, Mitchell Oldenburg, and Ty Masterpool all run Rekluse’s flagship auto clutch, RadiusCX. The fifth member of the team, Justin Cooper, runs Rekluse’s premier manual clutch, Core Manual TorqDrive. Star Racing Team Manager Wil Hahn said “[When I was testing RadiusCX], I honestly was blown away. The biggest thing that I couldn’t get over was no matter how hard I tried to stall it, I couldn’t. … I could just leave my hand off the clutch. I think the fact of how much of a difference a good clutch can make to your bike is very overlooked. What I realized from working with [Rekluse] is how much of a difference a good clutch system can make. At this level, all bikes are good, so every little thing helps. [Running Rekluse technology] is a pretty big deal to us.” Star Racing’s Engine Builder, Jeremy Coker, said “On the technical side of things, the durability on these clutch systems is unbelievable. … Dylan went 1-1 at Red Bud and we didn’t have to change a clutch pack all day long. Auto clutch advantages are [reduced] clutch wear and not stalling all while acting just like a manual clutch. You have those two major advantages without losing anything.” Rekluse Product Manager Austin Paden said “Congratulations to Dylan and the team for a great race and a great season thus far. The team using the full arsenal of Rekluse products, both auto and manual clutch technology, is the culmination of a longstanding partnership. The Rekluse team has always been fully committed to engineering and manufacturing the best technology for our partners. Getting our first Pro Motocross overall win with RadiusCX is a milestone achievement for us. We are proud to support Star Racing and look forward to many more wins together.” To learn more about RadiusCX, visit https://rekluse.com/product/radiuscx-clutch/
Different machines, types of riding, and skill levels may benefit from different clutch setups. So how do you decide which clutch is right for you? Here, we break down each of Rekluse's clutch offerings to help you make an informed decision. While riding a motorcycle may seem elementary to an experienced individual, it’s not the act of riding that’s so impressive as how a motorcycle works. Very few people take to the time to think about all of the minute steps required for a bike to even start, let alone be ridden. Of course, there’s the piston pumping up and down, fuel igniting in the combustion chamber, and the crankshaft turning energy into rotary motion. One of the most overlooked components of an engine is the clutch system. In fact, it’s generally considered an afterthought; that is, until it stops functioning properly. Never overlook the importance of a properly functioning clutch. Motorcycle enthusiasts may view the engine’s clutch as a small piece of a large puzzle, unnecessary to worry about until new clutch plates are required. However, the clutch can actually be a huge performance advantage. Rekluse, an Idaho-based company that has been making their own line of clutch systems for 17 years, knows this all too well. Their first centrifugal automatic clutch (known as the Z-Start), put them on the map. Top off-road racers across various disciplines have raced, and won, with the Rekluse auto clutch. As an aftermarket company, reaching the pinnacle of the sport can’t be accomplished by offering an inferior product. Every component is tested to its maximum capabilities before ever being used in a race situation. Today's Rekluse clutches are the result of 17 years of development, engineering, and testing. This is an ever-evolving process that fuels Rekluse's continued development. Rekluse offers six different options across the auto and manual clutch categories for dirt bikes. Although known for their automatic clutch systems, Rekluse makes state-of-the-art manual clutch packages. Which one is right for you? Auto or manual? RadiusCX or EXP 3.0? Core Manual TorqDrive or Core Manual? Read on to find out. Understand Your Options Think about your preferences, expertise, and shortcomings as a rider. Are you a beginning motocross racer, focused on mastering throttle control and maintaining corner speed? Perhaps you’re an avid trail seeker, searching for unconquered terrain in the most hostile environments. Whatever the case, it’s important to understand that your bike’s clutch can either help or hinder your goals as a rider. Understand that you have options. Different riders will benefit from different clutch setups. Read on to understand which of the various options will be most beneficial for you. Conventional clutch systems can be easily abused, leading to premature wear and eventual failure. Constantly pulling in and releasing a clutch lever causes fatigue. Automatic clutches can help solve those problems. Is there a drawback to using an auto clutch? Some may find the technology foreign, requiring practice in order to achieve comfort. Wrap your head around the idea of coming to a stop with the bike in gear and your hand off the clutch. Fortunately, Rekluse covers the spectrum of clutch configurations. Rekluse Technology Through extensive research and development, Rekluse created three technological advancements that are shared among various clutch systems in their line. These components are a telling sign of Rekluse’s commitment to achieving clutch mastery. EXP The Houdini of clutch tech, Rekluse’s EXP disk is responsible for engaging and disengaging the clutch based on centrifugal force. When the motorcycle reaches a certain rpm, the EXP wedges slide out to expand the disk and engage the clutch. All of this is happening from engine idle to about 3,000 rpm. The point at which the clutch engages can be fine-tuned with different wedges and springs for a customized feel. The EXP disk is the key to auto clutch performance. This is the piece that automatically expands and contracts based on RPM to engage and disengage the clutch. Austin Paden, Rekluse Product Manager/Race Development, elaborates, “There was a lot of thought that went into the ramp angles during the development process, and how the wedges would ramp out while rotating. Small changes to the wedges made a big difference in how the auto clutch performed. Our goal was to make something lightweight, easy to adjust, and functional.” This graphics illustrates the simple, but innovative, process of the EXP disk and how it achieves auto clutch functionality. EXP technology is utilized on the RadiusCX, RadiusX and Core EXP 3.0 automatic clutch systems. Read more about how EXP works and find clutch systems with EXP here. TorqDrive Exactly what the name implies, TorqDrive is based on the principle that using more friction plates in a clutch pack creates increased torque capacity. Rekluse accomplished this by decreasing the thickness of their plates in order to use more plates in the same confines, while developing their own friction material for increased durability. Check out how TorqDrive increases torque capacity. Paden states, “The idea was to increase torque capacity to the system. Ultimately, the goal was to allow for more tuning options, lighter feel at the lever, and lessen clutch operating temperatures. The world of Supercross and motocross is based around a standard functioning manual clutch. The market in that segment is very competitive. We learned that other companies were using standard-based friction plates. Yet race teams were still having issues with breaking friction plates and experiencing clutch fade, which was caused by expansion. Our goal was to find a fiber compound that was durable, even when the operating temperature became extremely hot, yet be thin enough to fit more fiber plates into that same working area.” "Our goal was to find a fiber compound that was durable, even when the operating temperature became extremely hot, yet be thin enough to fit more fiber plates into that same working area." - Austin Paden, Product Manager The friction plates are made out of steel, which bucks the trend of using aluminum. When subjected to extreme heat, aluminum expands roughly twice as much as steel. Expansion leads to clutch fade. Rekluse essentially solved an age-old clutch malady through metallurgy. Additionally, the steel-based friction plates have unusually shaped friction material totally unlike a traditional square or rectangle-shape. Paden explains, “We came up with our own fiber material and design, which is based around oil flow. That material is on a steel core, which maintains its integrity, even when the engine gets really hot. As a result, you don’t get clutch fade or constantly have to adjust the clutch cable in the middle of your moto. The Rekluse TorqDrive system contains 12 friction plates in most Japanese-manufactured bikes, versus seven or eight in a OEM/stock configuration.” Additionally, the TorqDrive pack comes with steel lining clutch basket sleeves to eliminate wear and notching to the clutch basket tangs. Rekluse left no stone unturned. Rekluse developed a more durable clutch fiber compound while simultaneously improving the pad design for better cooling. The fiber material sits on a steel core, creating a complete package that drastically reduces clutch fade. TorqDrive technology can be found in the RadiusCX and RadiusX auto clutches, as well as the Core Manual TorqDrive and TorqDrive Clutch Pack manual editions. Read more about how TorqDrive works and find TorqDrive-equipped clutch systems here. Core Heat is the mortal enemy of an engine’s clutch. Rekluse confronted that problem head-on by developing their own hub, pressure plate and clutch cover. Made out of billet aluminum and designed around optimizing oil flow to lower clutch operating temperatures, Core is literally cool. Paden states, “We made the parts lighter in order to create less rotating mass. In comparison to the competition, what’s noticeable about our hubs and pressure plates are that they have very open profiles. The bottom and top of the hub have features that basically act as a dam for the oil. Oil that makes its way into the center hub is directed through the clutch plates. More flow reduces heat. The pressure plate is also open, and any oil that comes from the front side of the clutch system makes its way to the center clutch.” Rekluse Core billet inner hubs and pressure plates are designed to promote better oil flow and less rotating mass. A close inspection of an OEM/stock hub will likely reveal oil holes and features that are located in the profile where the drive plates would ride. With this design, the holes are potentially blocked, preventing oil from reaching the clutch plates. Rekluse found a solution. Paden explains, “The Rekluse-designed hub has the oil holes and features on the ribs themselves. There are features in the drive plates, which act like pockets, so the oil is able to flow to the clutch plates without restriction.” Taking it a step further, Rekluse created their own clutch cover that allows for roughly 50cc more oil capacity. More oil equals decreased operating temperature. Rekluse billet hubs have oil flow features directly on the ribs, adding another measure to clutch plate oiling. Also, Rekluse billet clutch covers allow for additional oil capacity to keep things cooler. Core technology is utilized in RadiusCX and Core EXP 3.0 auto clutches, as well as Core Manual TorqDrive and Core Manual clutches. Read more about Core technology and find Core-equipped clutch systems here. Automatic: What are your Options? Rekluse offers three automatic clutch options – RadiusCX, RadiusX, and Core EXP 3.0. RadiusCX is the Taj Mahal of automatic clutch systems, featuring a plethora of Rekluse’s latest technologies. It contains the best features, as far as cooling and auto clutch performance. If you are a clutch abuser, the RadiusCX is for you. Like the other auto clutch options, the rider can use the clutch lever for manual operation. Given that it’s full of benefits, this is also the most expensive auto clutch in Rekluse’s line ($1,019). The RadiusCX is the ultimate clutch package for riders desiring the auto clutch. It includes the Core billet components, TorqDrive technology, the EXP 3.0 disk, and the billet slave cylinder for DDS models (shown here). Find RadiusCX for your ride here. RadiusX is the little brother to the RadiusCX. Featuring EXP and TorqDrive technology, the system comes with the EXP disk and clutch pack, as well as the clutch basket sleeves. It does not come equipped with the Core billet components, and as such, is priced at $629. The RadiusX features EXP and TorqDrive to deliver a great auto clutch experience, it just does not include the Core billet components to keep the price point lower. Find RadiusX for your ride here. Core EXP 3.0 ($919) utilizes the EXP centrifugal disk, meaning that you can come to a complete stop in gear with clutch out and not stall the bike. The package also includes the Core billet parts. OEM/stock clutch plates are required with the Core EXP 3.0. The Core EXP 3.0 includes the EXP disk and all the Core billet components, but utilizes stock clutch plates. Find Core EXP 3.0 for your ride here. Manual: What Are Your Options? Rekluse also offers three manual clutch options – Core Manual TorqDrive, Core Manual, and TorqDrive Clutch Pack. Core Manual TorqDrive ($949) was designed for serious racers, used at the Supercross level on down to the amateur ranks. It has the most adjustments as far as tunability, and outstanding durability. The kit comes with Core and TorqDrive technology. Find Core Manual TorqDrive for your machine here. The Core Manual TorqDrive kit inludes Core billet components and TorqDrive technology. The power delivery improvement and added durability is nothing short of impressive. Core Manual is essentially a billet replacement for the stock hub and pressure plate. Some riders may prefer the feel of riding with OEM/stock friction plates. If that statement explains you, then the Core Manual is your best option. It is priced at $519. Find Core Manual for your machine here. If you want the durability and cooling characteristics of the Core billet components but prefer the feeling of stock clutch plates, the Core Manual is your clutch. The TorqDrive Clutch Pack takes the clutch pack used in the Core Manual TorqDrive and puts it into a stock hub and pressure plate. It’s very affordable, and a good alternative for racers on a tight budget. At $349, it doesn’t break the bank. Find TorqDrive Clutch Pack for your machine here. The TorqDrive clutch pack gives you the advantages of increased torque capacity without the added cost of billet components. The most affordable way to get all the holeshots. What the Professionals Run Rekluse’s list of sponsored riders reads like a who’s who in all of the major forms of two-wheeled off-road motorcycle racing series. In fact, Rekluse relies on some of the world’s best athletes for product development and durability. Given that Rekluse produces a variety of clutch applications, it makes sense that their fleet of sponsored riders have their particular favorites. The 2018 Monster Energy Supercross Champion, Jason Anderson, along with the rest of the Rockstar Husqvarna factory team, prefers the Core Manual system, which they pair with OEM/stock fiber plates. Dean Wilson opts for the TorqDrive clutch pack, as it easily drops into a stock clutch system. The Star Racing Yamaha team has been using the full Core Manual TorqDrive kit for roughly five years. In that span, the 250 program has won championships with Cooper Webb and Aaron Plessinger. Rekluse products go through multiple stages of testing and development, from in-house prototypes to detailed refinements with elite race teams. Dubbed “Mr. Versatility” by Racer X Illustrated, Ryan Sipes has competed in a bevy of different off-road disciplines over the past few years. From ISDE to GNCC, Sprint Enduro and event Flat Track, Ryan’s clutch of choice is the RadiusCX. Another GNCC racer, Ricky Russell, has used the RadiusCX system for the past year and a half. It makes sense, given that GNCC races are gruelingly long at three hours, where hand fatigue and engine stalling can be major issues. Paden explains that Endurocross riders tend to bounce back and forth between auto and manual clutch options. “Auto clutches were incredibly popular for several years in Endurocross, and then racers started gravitating to manual clutches. Right now, we’re in this state where guys are going back to the auto systems. It’s one of those scenarios where if one guy who is winning goes auto, the rest follow.” Given that a motorcycle clutch is a beneficial aftermarket modification, it is a change that is quickly picked up and copied by the competition. Believe it or not, there are some riders who prefer to race Supercross with an automatic clutch. Paden explains, “I have done back-to-back testing with top privateers in Supercross, and most post faster lap times with an auto clutch. They couldn’t believe it. That’s because an auto clutch makes the bike's power feel smoother.” Smooth doesn’t feel fast to most riders, but the stopwatch doesn’t lie. Paden believes that more riders will start preferring automatic clutches in Supercross over time. It’s not a crazy theory, given that roll speed is an important part of clearing jumps and being successful in Supercross. While an auto clutch may not 'feel' as fast to some Supercross riders, many of those that have tested it have posted faster lap times. Could we see a migration to auto clutches in Supercross? If you’re still unsure of which Rekluse clutch to install in your motorcycle, give the clutch experts a call at 208-426-0659, or browse the Rekluse website at www.rekluse.com.