jetting on yfz

[allmixedup047]

we just cant seam to get the jetting right on this yfz. it has the ESR full exhuast, cam mod, proflow intake. the pipe came with an ESR needle but i think im going to take that out. this it what its doing. its stumbling on top end, its poping and shooting flames some times, and it wont stay running, it will die unless you have the throtle in. i thought it was running lean, but ive tried about every different combo's of jetting there is and i still cant seem to get it right. it never has ran like others since the day it was bought. so i dont know. its a pretty new one too, it was bought about 4 months ago.:confused:

[shep]

if its shooting flames and back firering it way to lean. turn your idle up to get to idle,go way fat on pilot and mian, then stat working your way back down!...GOOD LUCK, dont give up!!