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Found 6 results

  1. Check out my latest DJ Spark drone powered moto video from riding at Gifford Pinchot National Forest in Washington earlier this month. I implore you to at least watch the first 20 seconds, the drone intro is badass!
  2. RANCHO DOMINGUEZ, CA – March 8, 2017 – (Motor Sports Newswire) – Rocky Mountain ATV/MC stopped by the FMF Powerhouse last week to sit down to discuss some history of just what makes the FMF Brand tick. See what fire, metal and fumes have created over the last 45 years and let FMF’s own Don Emler Jr give inside scoop on what it means to be 100% Made In America. “Rocky Mountain ATV/MC brings you an Inside Look at the Flying Machine Factory. FMF was there in the days when the singleshock and watercooled engines were huge innovations and we’re glad to be here now for the aluminum chassis and electronic fuel injection. Our goal will never change – take the most advanced machinery to its limit by building the world’s best performing exhausts. And it’s a fact, we build every exhaust by hand from start to finish right here in the U.S. The biggest reward for us is knowing we’re helping our customers get the most out of their riding experience. We still ride every chance we get so we never forget why we got into this business in the first place.” Follow us: Instagram: @FMF73 Facebook: https://www.facebook.com/FMFRacing/ YouTube: http://youtube.com/user/FMFRacing1973 Follow Rocky Mountain ATV/MC: Instagram: @RMATVMC Facebook: https://www.facebook.com/rmatvmc YouTube: https://twitter.com/RMatvmc About FMF Racing Established in 1973, FMF Racing is one of the most dominant and influential brands in the world of Off-Road Motocross Racing. Founded by Don Emler in his Hawthorne, CA garage, the brand’s steadfast dedication to supporting the sport, along with its athletes and partners, has earned the respect and loyalty of industry consumers and insiders. From cutting-edge design to efficient manufacturing, sourcing, marketing, operations and distribution, FMF strives to elevate performance in every facet of the business. FMF Racing’s iconic red-and-yellow logo is still fueling the growth and passion for the sport of motocross more than 40 years later. The family-owned and operated company also features top level world-class race teams that continue to dominate the podium at events around the globe. Source: FMF Racing @FMFRacing73
  3. September 20, 2017 Motor Sports Newswire PICKERINGTON, OH – September 20, 2017 – (Motor Sports Newswire) – The American Motorcyclist Association has announced the professional competition numbers for pro-licensed riders competing in Monster Energy AMA Supercross, an FIM World Championship, and the Lucas Oil AMA Pro Motocross Championship for the 2018 season. All riders use the assigned professional number for competition. In addition, the current champion runs the No. 1 plate instead of an assigned professional number when competing in the class or region in which the No. 1 plate was earned. When competing in a class other than the class where the championship was earned, the rider must use the assigned professional number. 2018 Top 100 and Career Pro Numbers for AMA Supercross and Motocross * Career Numbers ** New Career Number for 2018 About the American Motorcyclist Association Founded in 1924, the AMA is a not-for-profit member-based association whose mission is to promote the motorcycle lifestyle and protect the future of motorcycling. As the world’s largest motorcycling rights and event sanctioning organization, the AMA advocates for riders’ interests at all levels of government and sanctions thousands of competition and recreational events every year. The AMA also provides money-saving discounts on products and services for its members. Through the AMA Motorcycle Hall of Fame in Pickerington, Ohio, the AMA honors the heroes and heritage of motorcycling. For more information, visit www.americanmotorcyclist.com. Not a member? Join the AMA today. Source: American Motorcyclist Association
  4. Revolutionary New TE 250i & TE300i Machines set to Change Perceptions about 2-Stroke Enduro Bikes April 4, 2017 - (Motor Sports Newswire) - Husqvarna Motorcycles proudly announce the introduction of their next generation fuel-injected 2-stroke enduro motorcycles. Perfectly embodying the brand’s pioneering spirit, the new from the ground up 2018 TE 250i and TE 300i machines will feature engine technology that is set to revolutionise the field of 2-stroke enduro motorcycles. Enjoying over a century of uninterrupted design, development and production, Husqvarna Motorcycles are now set to add another benchmark to their impressive timeline of innovations. Being one of the oldest motorcycle manufacturers, and the first company to ever produce a purpose-built offroad bike, Husqvarna Motorcycles have always been a great advocate of 2-stroke technology. From Rolf Tibblin’s first Motocross European Championship in 1959 to the golden age of motocross during the 60s and the 70s, Husqvarna has remained a dominant force in the segment of high-performance 2-stroke offroad motorcycles. With their new generation of fuel-injected 2-strokes arriving soon, Husqvarna Motorcycles will proudly start a new chapter in their history of pioneering innovation and forward-thinking development. This revolutionary new technology will go into production in June. Additional information about Husqvarna’s MY18 2-stroke enduro models will be released on May 30, 2017. http://www.husqvarna-motorcycles.com/ca/news/2-stroke-enduro/ *** Husqvarna Motorcycles. Tradition on two wheels since 1903. Husqvarna Motorcycles are widely known and respected in the off-road world for a heritage of competition and numerous motocross and enduro world championships. Originally founded in Sweden in 1903, Husqvarna Motorcycles have been designed and manufactured in Mattighofen, Austria since 2013. Source: Husqvarna Motorcycles GmbH
  5. Hey y’all I picked up a running blaster quad for reallllll cheap ($100) :) I was wondering if I could swap the blaster engine in the rt180 frame and if it would work or rather it’s not worth my time All Responses Appreciated, Jared
  6. Paul Olesen

    How The Two-Stroke Exhaust System Works

    In my last post, I shared details about how the two-stroke cylinder works, in today's post I want to provide an overview of how a performance two-stroke engine's exhaust system works. Adding a performance exhaust system can be a great way to increase power and/or alter the power delivery of an engine. I would also argue that optimizing a two-stroke engine’s exhaust system is equally as important as ensuring the cylinder’s ports are correctly designed for the given application. Not all exhaust systems are designed to do the same things, and much like cylinder port design, exhaust designs are intended to alter power in specific ways. Having a basic understanding of how an exhaust system works can go a long way when it comes to selecting the right exhaust pipe for your engine. Two-stroke exhaust design is complicated and there are many different variables that must be considered when designing a pipe. I don’t intend to go into all of them, but I will share a few of the most critical. Each time the exhaust port opens to release spent combustion gases, pressure pulses are created. Modern pipe designs harness this pulse energy and use it to help scavenge and fill the cylinder. The process starts when a positive pressure pulse is created once the exhaust port opens and combustion gases leave the cylinder. The positive pulse travels down the pipe until it reaches the diffuser, at which point part of the pulse is inverted and reflected back towards the cylinder as a negative wave. This negative wave is very beneficial in pulling spent exhaust gases out of the cylinder and fresh mixture up through the transfer ports. The remaining positive pulse continues on its journey towards the end of the pipe where it encounters the reflector. The reflector acts as the name implies and forces the positive pulse back towards the exhaust port. Once reflected back, the pulse remains positive and, if the pipe is designed correctly, will reach the exhaust port just as the piston is about to close off the port on the compression stroke at the desired RPM for maximum power. Any fresh mixture which has escaped out the cylinder will be forced back in by the positive pressure pulse. The tuned length of the pipe is dictated by the exhaust port timing, RPM of max power, and the speed of sound. Pulse length and amplitude are governed by the angles of the diffuser and reflector. Generally, steeper cone angles create pulses with more amplitude but shorter duration. Shallower angles generate pulses with less amplitude but longer duration. Given these variables, it is easy to see how a pipe could be tailored for specific applications. An engine converted for road racing may utilize a pipe designed for peak power which incorporates steep diffuser and reflector cone angles so that pulse amplitude is not sacrificed. This peak power would likely come at the expense of a narrowed range of power. An engine tailored for woods riding may feature a pipe with shallower cone angles, resulting in less pulse amplitude, but a broader spread of power. The last parameter I want to touch on is how the tailpipe, which is sometimes referred to as the stinger, influences the pipe. The tailpipe creates a flow restriction in the pipe which allows the pipe to have a certain amount of back pressure. Enlarge the tailpipe and the back pressure decreases, make it smaller and the back pressure increases. As back pressure increases or decreases, so does temperature and ultimately the speed of sound. As the speed of sound changes, so does the resonance RPM of the pipe. If the tailpipe is sized too small, cylinder scavenging will be inhibited. When this happens, the cylinder, fresh mixture, and piston will all be overheated. While engineers and tuners can estimate starting pipe dimensions and tuned lengths, a great deal of trial and error testing is usually still necessary to fine tune the exhaust pipe and optimize the design. Unless you intend on building your own exhausts, this work will have already been done for you. When selecting an exhaust system, you need to focus on how the exhaust alters the power curve. Exhaust systems are tailored to deliver more bottom end performance, top-end performance, or performance throughout the power curve. Selecting which system is right for you will depend on how you want your engine to perform. If you’ve chosen to modify your cylinder ports, installing an exhaust system that compliments the porting can be very beneficial. You might be wondering about slip-on mufflers. If you’ve followed along with my explanation of how exhaust pipes work, you’ll notice I made no mention of the muffler. While the muffler can have a small effect on performance, it is not the primary factor. Upgrading a muffler is a good way to reduce weight, but there won’t be a slip-on out there which significantly increases power, in the same way, a properly designed expansion chamber can. I hope you enjoyed this write-up on key features affecting the performance of two-stroke cylinders. As for Two Stroke Handbook news, we received our first printed proof of the book this week! Needless to say, we are inching closer and closer to an official release date. To stay updated on The Two Stroke Dirt Bike Engine Building Handbook we created an email sign up for our readers. Click this link to sign up, see the new cover, the Table of Contents, and some sneak peek pages right from the book. Thanks for reading and have a great rest of your week! -Paul
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