My Raptor 660 will shut off if I'm going down hill, and sometimes will shut off if I hold in the clutch and come to a complete stop. Other than that the quad runs great. Also if I have it running and sitting in neutral 30sec to a minute later it will just shut off. Previous owner said he bypassed the rev limiter or something, could there be a problem with that? It has been flipped before, and I read something about a lean angle sensor? I don't know if its an electrical problem or maybe my air/fuel mixture needs adjusted, or my idle. My starter just got replaced, but it did this before that. Any help would be very much appreciated!