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Yamaha - 2005 yfz jetting problems

Yamaha YFZ450/450R (2004-Present) - Yamaha ATV Forum - www.bluetraxx.com
alright guys i recently rebuilt my yfz for it smoking as someone used a k&n engine duster filter as i call them and the cylinder was glazed. anyways while i had it apart i put all new bearings and i put stage 3 hot cams and a 13:1 gytr piston in there. anyways got it running engine part is fine but the running and jetting is the issue im really having. before i messed with the carb it had a 48p and about a 170 ish main. now that i have the 13:1 im running vp110. i have backed the pilot to a 45 and now a 42 and the main down to 165 and the needle on the 4th clip from the top.ive played with the fuel screw 1/4 at a time. im having problems starting it without giving it any throttle and it staying revved up when i do rev it. pipe isnt glowing im guessing i am running a little rich. and iforgot to add i do have a quickshot 3 i adjusted it as to the instructions my brother had when he got his qs 3 for his ltz. i have been searching forums for peoples jetting with race fuel but they either do the cam mod without a high comp piston or vice versa. anyways im open to ideas as i havent made much headway yet. it will blue flame and turn over numerous times before it will start without any throttle.
Date: Feb 6, 2017    Labels: Yamaha


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