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  1. i have an 04 yfz 450 i put in the stroker crank 1.2 mill athena big bore yz needle in the 3rd clipup from bottom- ported head-biger valves- webcams powernow-boisen quickshot lighten flywheel lockout clutch loonytoons split exhaust 4 over swingarm now i have a 60 pilot and a 190 main jet when i get to about 3/4 throttle it starts to spit and sputer like it is starving for more gas. i talked to the yamaha shop they said my jets were to big. it sounds to me like i need bigger jets? different needle placement? anyone have the same problem. thanks a mill john