04 Yz450 Studder/miss??

I have 2004 YZ450F that has a studder or a miss at about 1/8 to 1/4 throttle. I have changed the main jet to a 170 and the pilot to a 45, fuel screw is about 2-1/4 turns out. The problem was there before I rejetted. Other than that the bike is completely stock. I live in Oregon about 300' elavation. Any suggestions??


Thanks Ryan

yep APmod, ZipTy Racing and R&D Floatbowl:thumbsup:

You have the bog....ap timing/squirt is probably off

Search APmod, Zipty carb mod or the R&D will help you fix.....

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