Hi there I’m Kirby got an 05 grizzly 660 sitting on 29.5 outlaws, stock exhaust, 2 inch snorkels and a radiator relocate kit. recently put a mudder clutch kit in from EPI, and have been messing with this Dynojet kit i just bought. So far Ive found the 160 main jet to be the worst Ive tried yet. the 155 was what came stock(at least when i bought it from a buddy that’s what was in it) and I tried a 150 first. 150 sputtered at 3/4 to full throttle, 155 sputtered at 3/4 to full throttle as well and the 160 sputtered at anything above 1/3 throttle did idle high as well. until i put in the 160, the fuel air screw was fully tightened down(150 and 155 both had a fully tightened air screw). not sure whats going on if anyone has any help for me it would be greatly appreciated. Don’t be afraid to ask me any questions about the bike as well. thanks.