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Discussion Starter · #1 · (Edited)
Hey guys, first post here. I've lurked around here for the last couple weeks and really can't find the info I need about my problem. I recently aquired an '05 YFZ450 with a 500cc kit put together by a local shop. It also has the cam mod, +1 valves and YZ needle. It has a 190 main, 45 pilot and the fuel screw is turned out 3 turns. My problem is a stutter and backfiring problem at 1/2 to 3/4 throttle. It also doesn't clean out at full throttle. I've adjusted the fuel screw from 1 1/2 to 3 turns with no real noticable difference. I've also moved the needle from the 3rd, 4th, and 5th position with no change. TPS tests fine, unplugged it and made no difference. My elevation is 5600. Any help would be appreciated.
 
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