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Old 06-17-2011, 08:47 AM
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Default 2004 yz250f jetting specs

     

i have a 2004 yz250f and i just got a fmf speed muffler for it. i am not sure if i need to adjust the jetting at all. but i am getting a backfiring while coasting with no throttle. maybe my carb just needs to be cleaned, or maybe i need to make a few adjustments to my jets. any ideas?
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Old 06-17-2011, 10:30 AM
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Quote:
Originally Posted by yzracerf View Post
i have a 2004 yz250f and i just got a fmf speed muffler for it. i am not sure if i need to adjust the jetting at all. but i am getting a backfiring while coasting with no throttle. maybe my carb just needs to be cleaned, or maybe i need to make a few adjustments to my jets. any ideas?
Popping is a good indication of a exhaust leak.... I would check the pipe first, and usually when you improve flow (intake / exhaust) you need to fatten up the jetting just a tad.

Thanks
Scott
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Old 10-10-2011, 09:31 PM
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Default 05 yzf jetting

any help i got a 05 yz250f with a LexxMXc slipon and a powerbomb header current jetting r 182 main, 42 pilot and clip on the 5 th one ... any jetting help what about a 185 main?
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