if you jetted it with a different pipe setup, it sounds like your not getting enough air flow. Try taking the cover off the air filter and see if that makes it run better. Some of my buddies have drilled holes in the cover, but to each his own right. Bigger jets need more air.
A forum community dedicated to Yamaha Raptor owners and enthusiasts. Come join the discussion about performance, news, modifications, troubleshooting, maintenance, and more!