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Found 197 results

  1. D.Barrett

    jetting '01 CR250 PWK Jetting

    I've been doing quite a bit of reading on the subject but just looking for more insight on my particular setup: I have an 01 CR250 with a 38mm Air Striker from JD Jetting. It currently has the factory(JD) jetting in it: #7 slide, 45 pilot, 175 main, blue needle on #3, air screw 1.5-2 turns out. The bike has a fresh top end(did it when I installed the carb), Boyesen carbon fiber reeds, FMF Gnarly pipe, and a fresh-packed FMF Shorty silencer. The idle/pilot seems to be pretty close, although it may be a bit rich. I've noticed the air screw doesn't seem to have much affect when adjusting it. The other issue I've noticed is a slight bog when I get on it at lower speeds/RPMs. IE: Making a slow, tight turn in first gear and then getting on the throttle coming out of the turn. There's no sputtering/etc, just a bog/hesitation. I'm assuming the needle will play a big part in fixing this, but does this indicate a rich or lean condition? Also, I'm setting this bike up for single-track/enduro/woods riding. Any advice on jetting/needle combos that'll give me the cleaner part-throttle/low RPM response I'm looking for? Edit: My altitude is around 600-700 above sea level(Chicagoland) and the current temps are in the 60s-70s.
  2. working on a 2004 yz125, doing the jetting and i had to drop it down from a 420 main to a 400 bike wouldn't even run under load with the 420. so the 400 got it good but i got a bog still at 1/3 throttle so i raised the needle clip from slot 3 (center) to slot 2 and it helped a good bit, i think dropping it 1 more slot would work perfect but is that an acceptable procedure to max out the needle? is it like the pilot jet where if its not between 2-3 turns you have to change the size of the pilot? in my case dropping the main jet size 1 more size or am i okay to max out the needle?
  3. So I have an 07 cr 125 fouling plugs before the bike even has a chance to warm up, plugs come out wet and oily on the tip. had both crank seals replaced last season because my main drive side seal blew. While it was split I had a new crank put in, we noticed my cylinder plating was pooched so I sent my cylinder off to be re-plated, put a new piston in the shiny new looking cylinder put the old warped head back on and called it a day. then rode it all season having absolutely no idea about the warped head because I overlooked it when I was excited to put my bike back together and ride. Its now winter, snows on the ground. I recently went to go for a put and fouled a plug before I could get to the end of the street and back. I was also smelling coolant so checked the rad while running the bike, lots of movement and tiny bubbes. Pulled the head off and sure enough it was warped to the point where I could rock it back amd fourth on the mirror and see a small gap... so NOW after I replaced the head my problems persisted and I can still see little bubbles swirling around vigorously in the rad if I rev it with the cap off, I've had boiled it down to my cylinder probably being warped then I found a leaky hose by the exhaust that was dripping coolant onto the outside of the exhaust port. Which brings me to what I think may be an incredibly stupid question, could it just be the loose hose sucking in air that is causing my rad fluid to have small bubbles in it? And maybe im just experiencing increadibly rich jetting now that my head is actually sealed properly? over and out.
  4. Hey guys i recently acquired a 2012 Yahama yz250f and i will need to be re-jetting the carburetor. I'm not really sure where to start on what size jets i will need. I ride between 7,000 and 10,000 feet in elevation.
  5. JohnClaude

    2005 WR450F Needle Suggestion

    Hi Everyone, I just picked up a 2005 WR450F. I was wondering if anyone had a recommendation for an adjustable needle (it appears that the stock needle isn't adjustable?). I live in Denver and ride from 5,000+, bike also has a FMF Q4 exhaust and megabomb header. Looking for a stock needle that's reasonable and readily available (not JD at this time). Also, fun fact- noticed that the previous owner had stripped out all the philips heads that attach the float bowl to the carb body. Had to access the jets via the hex opening, and the carb is pretty varnished. Should I attempt to cut into the philips head to get a flat head in there to remove the screws? Any suggestions? Leaning towards cleaning things out the best I can without removing the float bowl.....Thanks for the help! -John
  6. MNThumper250

    CRF250X Spark Plug: Jetting Changes?

    I'm tearing down my '06 CRF250X for winter prep. I checked the spark plug (see pics). I've rode with this plug for most of the summer. I'm thinking it's a bit rich, so for the other 250X owners out there, what jetting are you running/what do you think I should run? The only mods I've done is install the JD Jet Kit (165 main, 42 pilot, Red needle 4th clip, and thick o-ring), FMF Q4, and 4" x 4" hole in air box (with No Toil Super Flo Kit). The bike seems to run alright, but should I drop a few on the main jet?
  7. Hey guys! Im gonna start out with posting all the information i think is needed for you guys to help me with this problem! Stock engine 2007 crf250r. Valve clearances are good and have JUST been shimmed with a double and triple check. Jetting is 175 main, stock needle position, 45 pilot and 50 leak jet. 1000ft above sea level. Im still having a terrible time starting and it used to be a 1 kick bike. I haven't changed my kick routine at all. 3 slow kicks, 3 throttle twist and then kick. Will sometimes start if i give it some gas when kicking. And then it starts 1-4 kicks after its warm. Im lost and dont know what else to look for. Thanks!
  8. KeyKeeper

    06 Franken bike Jetting

    Have a johnny cash bike (stole it one piece at time...didnt cost me a dime...) apparently. Main frame and motor are 06, subframe was an 05, replaced it with an 06 so my exh midpipe would have something to bolt to. My idle has been really funky lately with the heat (100+ days) so I built a heat shield to keep the carb cooler. On tight trails it hunts for an idle and that gets kinda nerve racking with bike constantly lurching, sure wears my clutch hand out quick. Pulled my air filter out to clean it and it had separated at the seam...whoopsies. So bought a new air filter and its still running funky at idle. Pulled the carb last night, figured the idle air jet may have garbage in it since its right there by the intake boot. Nope, its clean. So pulled the bowl since I didn't have a clue what pilot jet and MJ was in it. I know it has the factory needle and in the 4th slot. Was in the 3rd but I dropped it(the clip, not needle) one position to fatten it up and have it run a little richer (cooler). Well the main jet and the PJ are way too big based on the 06 manual. So for grins I got out my dial caliper and measured the bore on the head side and bam...its 41mm FCR carb. Supposed to have a 40mm on it. So downloaded the 08 manual and realized that the MJ is right on point for the 41mm carb. 178 but the idle jet is a 68! the manual says 42 is right, and from what Ive read everyone goes to a 45. So since this is a 41mm should I go with the 45 or maybe a 48? Not sure if the bore will matter since the slide will be closed most of the way anyways at idle.
  9. yam469

    2008 yz450f

    Whats the jetting for 2000ft elevation on a stock 2008 yz450f main and pilot to start with ? On my sidecar it has a custom pipe and exhaust
  10. Hey guys I've got a 2009 CRF450X with a RS-2 Yoshimura full system on it. I've had it for 2 and a half years now and its great, but since I put the Yoshimura on 8 months ago, it has not stopped backfiring on deceleration. I've played with the fuel screw both ways, and when I finally pulled my plug the last time I had my bike apart I saw white, so I turned the fuel screw out to give it more fuel. Didn't work. Actually seemed to make it worse. I'm beginning to suspect that I'm barking up the wrong tree, that there might be something else going on besides just jetting. The guy who owned it before me put a JD Jetting kit in there with a 165 Main jet with the red needle in the 4th position from the top. Maybe I'm overlooking something or maybe it something deeper. Help me Thumper Talk! -Kennedy p.s. I just had my valves adjusted about a month and a half ago
  11. klxkid

    Spooge on IT175

    Just bought a 2 stroke, 1982 IT175, and it runs good but sprays out spooge from the silencer, and dribbles it out at the header where it bolts to cylinder. Bike runs good but may be a bit sluggish at low rpms. Not the the point where it bogs. just a little sluggish. From research it seems like it may be running rich. Wondering what I should try. Raise the clip of try a smaller jet? Running 32:1 right now. Any help is appreciated!
  12. Hey I was just wondering if anyone could help me with jetting specs and proper premix ratio. I have a 2004 yz250 2 stroke with v force reeds, and a pro circuit fatty pipe. Mostly trail ride and hill climb with some track activity. Was wondering if anyone e could shed some light because it seems like I'm running super rich. Any help is appreciated, thanks!
  13. Lamborghini Live

    Main jet

    Need some pro tips on a main jet question for my 1991 Kx 125
  14. idratherberiding

    KLX450 FCR Carb Setup

    2008 KLX450, FMF power bomb header, FMF Powercore 4 muffler, Desmogged, Air box top off 1000'-3000' altitude. 40 - 80 degrees Fahrenheit. Humid during summer I ordered the KX NCVR needle. What clip position should I put it to? Had a 155 Main jet, seems way too lean. Should I go 165 or 170? Have a 42 and a 45 pilot, not sure which to use with NCVR needle. What leak jet should I run for best throttle response/least bog? Currently have size 50 leak jet, I'm guessing it's stock as it has the Keihin star symbol next to the number. Float is at manual recommended measurement. Any suggestions are appreciated, thanks
  15. Like I said I have a 2008 KTM 450 exc. I live in Southern California along the coast in Dana Point. Riding is almost entirely all desert. So far average altitude is maybe 1-3k pretty much sea level to about 5000 ft is where I normally take it. Whenever I blip the throttle when stationary the bike dies. I’m trying to put some money into the bike to release some more power. I’ve gotten lots of recommendations: jd jetting, new exhaust system, gearing, suspension etc. so I want to get this throttle problem fixed with the right parts. Anybody care to point me in the right direction if jetting or jetting/exhaust is the problem for me ?
  16. I rode around a bit reving it out then made a final hard pass before i removed it.
  17. hey guys. i have an 03 rm 125 with jetting issues. i've jetted it multiple times. currently has all stock jetting (460 main,40 pilot, 3 down on clip) and i'm running amsoil dominator full synthetic premix. was running castor 927 but fouled a $30 plug which i'm not very happy about. anyways.. does my plug look alright? should i run a $30 plug in it? i'm not trying to get it too lean, and i'm not trying to foul plugs. 440 (next size down) is too lean. not sure what to do. this is how my plugs are looking right now. there not too wet, just pretty dark
  18. Hey All, I have a question about needle taper and how it affects fueling? 2003 DRZ400S (E model FCR39, 3x3, E Header with fiber wrap, Stock S muffler with endcap mod, and stock S cams). JD JEtting stage 2 Kit for DRZ E model, not for the S model with FCR Current Carb Settings: -155 main -Blue needle 2nd clip from top (DRZ E taper profile) -Coast enrichener removed -everything else stock E Carb settings (including slow jets, and air jets) -idle screw = 2 1/8 turns out (and idles perfect) I ordered the EMN needle as per suggestions from other TTers My Question: I was just wondering what the EMN needle would do to my AFR graph? The taper chart doesn't make sense to me. If you see the attached image, my AFR seems to be rich at 1/4 and 4/4. I believe the EMN needle will flatten/richen out my mid range. So, to compensate I also bought a 150 main. Is this a correct assumption? PS. Is the first rich state the AP effects? I know it's too rich because it's not a punchy as a pumper should be. I'm saving up for a leak jet kit/power bowl/AP cover, but was just wonder what effects to look for when I start tuning more in the next few months as funds become available? Thanks! Note: Blue is first run with needle clip in 4th from top. Red is 5th run with needle 2nd from top to lean it out. Note:
  19. Hi I have read lots of similar topics on here and elsewhere, but couldn't find an answer that seemed to fit. I have a 2003 DRZ400-S with an old - style FCR39 slant fitted (now with Eddie mod for about a 1 second AP spray) as well as an FMF pipe, and the previous owner has attempted a 3x3 on the airbox but it is more like a rough 2x3. Air filter is standard Hiflofiltro oiled foam type. I live in the UK so altitude is more or less sea level, the air is fairly humid and the yearly average temperature is about 15C which is around 55F I believe, or average lows of 0C in winter and 30C in summer. Now, the bike doesn't exactly run poorly (now that I've just reassembled the carb after the pilot jet fell out into the bowl and the bike sounded like a misfiring Harley), power delivery feels fairly decent throughout the rev range but I know the carb runs quite rich. The best economy I've ever got can't be more than about 30 MPG. I have just done the Eddie mod and got the AP spray down from about 4-5 sec to about 1 sec so I hope this will help fueling. When I changed the spark plug the other week to a standard CR8E (There had been a CR9E in there) it was very black and filthy/sooty. Also the backside of the rear registration plate, which has only been on there about a month, is already covered in black splatters and sooty sideblast from the end can. Also, I have one of those R&D flex fuel screws attached, doesn't do anything even if you turn it all the way in. Main jet is 155 Starter jet 70 Pilot Jet 42 Sorry I don't know which needle - I took it out but stupidly didn't note down which, I know it was about 5 letters. If I cut out the airbox to the correct full 3x3 size, will this lean things out a little and have it running better? Or is it worth changing some of the jets down due to the fuel screw doing nothing? Any advice is greatly appreciated as I am a complete noob to carburetors and have hardly any idea what I'm doing! Thank you for any light you can shed on this.
  20. I have a 2004 Yamaha WR250F that the previous owner modified and the bike doesn’t run the way it should. It has an FMF muffler with an aftermarket pipe coming from the engine. There’s no other silencers or restrictions in the exhaust. When I got the bike, it was backfiring every time I let off the throttle no matter what speed I was doing. When the previous owner first started the bike, part of the exhaust pipe was cherry red while he was warming it up by giving it more throttle. I took the carburetor apart and found out that I have a 178 main jet, 40 pilot jet, and 72 leak jet. The needle clip was in the middle in the 4th position. I adjusted the fuel screw back to the 1.5 turns out position from the 3.5 turns out position the previous owner had it set at. I changed out the pilot jet to a 45 and the bike no longer backfires while I ride it but it does die when I leave it to idle. Sometimes it dies immediately after letting off the throttle and other times it will idle for a minute or two before dying. Now before this gets too confusing, I ran the bike with the fuel screw at 1.5 turns out and 3.5 turns out after changing the pilot jet. At 1.5 turns out, the bike would only run when choked and would die when idling. At 3.5 turns out, the bike will run with the choke off but will still die when idling. If anyone has any suggestions to try, please let me know.
  21. GFinch106

    CRF250X Jetting HELP

    I recently purchased a brand new 2015 CRF250X. Since purchasing I installed the JD jet kit, and completed the air box mod. I live and ride in Kentucky, between 800 - 1200 feet above sea level, with the temperatures ranging from upper 70's to high 90's. I followed the JD jetting instructions and replaced the stock main jet with a 158 main, the pilot jet was changed with the 42 that came in the kit, and I replaced the stock needle with the red needle, with the clip in the fifth position from the top. I also removed the stock air mixture screw and replaced it with a R & D racing flex jet fuel screw backed out 1 3/4 to 2 turns. The bike has completely stock exhaust, with the OEM air filter. The bike seems to run alright, but there are a few things that I have some questions on. Before doing the mods to the bike you could pull the hot start lever all the way in and the bike would die. But now since doing the mods the bike will idle faster once the hot start lever is pulled in all the way. The same thing happens with the choke lever. Once the bike is good and warm if you pull the choke out the bike at first doesn't really do anything, but once you give it some throttle it will idle faster. The bike now has a backfire problem, which I never noticed before I did the mods. The backfire isn't necessarily a high pitched loud popping sound, but more of a low sound, almost like a large amount of air is being forced out. I've noticed the backfiring mainly happens when decelerating, or when dropping gears too quickly. My 250X does have the smog equipment attached. If I stall the bike while out riding it seems to be very hard to start, and most times I have to pull in the hot start lever to get the bike started. Before the mods I never used the hot start after I stalled the bike. As I try to restart the bike back it makes the same backfire noise like it does when I am out riding. The idle speed seems to not stay consistent. I'll warm the bike up and check the Works Connection hour meter and it will be reading around 1800-1900 RPM. Once I've been riding for some time, and come to a stop, the RPM meter will be reading more in the 1700 range. The RPMs at idle don't stay constant, I find myself adjusting the idle screw a few times while out riding. I am also having the problem of the bike randomly stalling. For example, I could come to a stop with the clutch engaged, sit still for a few seconds, and when I give the bike a little rev it will stall and die. The throttle doesn't even come open when it stalls, I just barely give it a turn and it will die. Like stated before, when this happens the bike is hard to start back, and backfires when trying to be started. I have tried playing around with the fuel mixture screw, but nothing seems to correct the problems I am experiencing. The bike seems to run fine other than the stalling and backfiring. I am not sure if changing jet sizes or clip position would correct the problems I am having. I have tried researching these topics, but nothing seems to be like what I am experiencing. Any advice would be greatly appreciated.
  22. luke8500

    DRZ110 running rich

    Hi all, I have a completely stock 2005 Suzuki drz110 (same thing as a klx110) and it is running way to rich. It wont idle at all but will hang before it dies. It puffs a little bit of black smoke too. It always starts 1st kick and has decent power. Jets are stock at 35 pilot and 80 main. playing with the idle and fuel screws don`t do anything. Spark plug is black but it doesn't foul plugs. checked all around engine for air leaks with carb and choke cleaner and have found none. Air filter is clean and valves were just adjusted. Im out of things to try. Any help would be greatly appreciated. Thanks Luke
  23. 2001 yz250 I need some assistence, first time user. I am new to this, aquired 3 two stroke like new bikes. They really need jetting know how and jets size MAIN JET AND PILOT. AIR SCREW. I will apreciate any help. I am a serious enthisiast with smokers. 2 Tiempo. I want it to clean real nice but im also running wiseco piston and do 30:100 MOTUL 800. Dont know to run the castor mixes? //////// I also have HONDA CR250 2003 with the mikuni and it needs some tunning!!! HAVE NO IDEA
  24. Suzuki_DR650SE

    DRZ400E Carb Question

    Ok, so I have had my DRZ for over 16 years now but for the last 2 years its been hell keeping it alive. I think its the carb.. but not totally for sure. I have rebuilt it three times in the last 2 years and keep finding junk in my bowl and jets. I have cleaned the tank, put in fuel filters and fuel lines.. I dont know if its coincidental but after getting my new tank from IMS its been down.. I asked them if the tank needed to be cleaned out prior but never got an answer. Its weird tho, each time I rebuild it I have to replace the pilot jet and the float valve and seat. It seems like it runs like new for one day.. but then its back to crap and not idling again. Just pops and dies.. then my pipe is glowing red hot.. I am about to give up on this thing. I purchased it in 2001 right from the dealer it had Calif License Plates and street legal. Love the bike when its running. So I have people telling me its my carb still.. I just took it out the other day blew it out with carb cleaner removed the jets and made sure all looks good. The carb is not leaking fuel so the float valve and seat are still good. I am thinking about buying a refurbished/rebuilt carb for 525$ is the best deal I have found.. But dang.. if that is not it I am really beating myself up good. Then someone from Kiehn said it was my Mid gaskets.. I am just really frustrated. If the replacement carb works I am going to tear this one down and replace the mid gaskets and go from there and test it.. if its good. then it will go on ebay and try to recoup my money back.. What do you all think? 2 years now if pulling that thing off and on and 3 full rebuilds.. Also I found this link on "How to DRZ400.." it shows a flat side like mine going on an SM model to swap out the mikuni carb.. I noticed one of the pics (see attached) shows to remove the Pilot air jet on the intake side of the carb.. why is that? Why do I still have mine(which I replaced every jet on the carb just back in November again). Also included is a link to it running and what it does, even with choke on its not as smooth as it used to be, DRZ Running Thanks in advance for any input.
  25. To those of you who ride both during summer and winter, how often and which jets do you have to adjust? Let's say you get the jetting bang on during the summer at 30 degrees. How much of a temperature difference is enough to make you re-jet? And if there's a big change in temperature (let's say you want to ride at 0 degrees during the winter, same altitude), which jets do you change? Is it enough to just change the main jet and adjust the air screw, or do you change the main jet, pilot jet and the needle (or the position)? I want to hear from those who have personal experience, concrete examples with jet sizes would be nice. I've read many tutorials on jetting, but most of them just tell you how to adjust the jetting right now, not the things I mentioned.
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