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Dirt Bike Brands - Other
'02 WR426 misfire issue
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[QUOTE="Strick, post: 648663, member: 16681"] Rule #1 never try to out guess an owner of a bike you JUST purchased and had never owned in the past (Humai & JasonJ). Here is my story and my findings: For anyone interested. After a lengthy discussion with the previous owner of this WR regarding the mechanic that set up the YZ timing, I felt comfortable in believing it was performed correctly. The gray wire had also been cut, the throttle stop shortened and the BK mod installed. With, what I feel a strong jetting background, I decided to head in that direction. I first checked the slide plate to make sure it was not installed upside down like some KTM's last year. I then installed a richer needle (OCEMP #5) - simple, quick try. I cold fouled the spark plug within 30 seconds. So, back to the drawing board. I decided just to remove the carb and check out the baseline settings and go from there. Stock needle (DRR #5) 45 pilot, 155 main, BK squirt ~ 2.5 seconds, mixture screw at 2 turns. I then realize I probably went the wrong direction with the needle clip position, and also quickly discerned the jetting was actually somewhat backwards. I change the needle (EMP) clip to #3, I take the mixture to 1 1/2 turns, I install a 38 pilot, 158 main, and time the BK squirt to what looks to be just under one second. Also one other interesting find. The spark plug was gapped like a KTM = .24. I installed a NEW plug at .30. I put in fresh gas, turn on the petcock, pull out the choke, give one full turn with the throttle, go one click past TDC with the kick starter, no luck. Once more - one click past TDC bring the kick starter back to the top, like before, and she purrs like a kitten (except I had the idle turned to high). I give the WR once (or four times) up the street and back, Man does this bike run. No surging, no back firing, just one heck of a pull. The head pipe did glow red when I was letting it idle and checking for any bog or backfire, but I hear that this is a normal occurrence with these bikes. Thanks for all the responses. I just wanted to let everyone know the findings. [/QUOTE]
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Dirt Bike Brands - Other
'02 WR426 misfire issue
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