Raptor jetting problem

[KingBobRaptor]

I put a yoshimura pipe, K&N Filter, and main jets in my 2003 Raptor 660r. Now it cuts out on top end. I need to know whats going on. Do i need to adjust my air fuel mixture or what.

[03dynasty]

if it cuts out on the top end (3/4-wot) your main jet is too big. Work your way down until it doesn't cut out anymore. First take you airbox lid off and see if it still cuts out.