Ok here's what I got. I just bought an 01 raptor yesterday with a 680 big bore kit. When I bought it we pulled it out of the guys heated garage and it fired right up and I bombed around on it just fine. Got her home and wanted to go for a ride. Went to fire it up and she would bearly crank. it was cranking really slowly and when it hit compression stroke would sometimes just stop. I though ok dead battery I put a jump pack on and cranked a little faster only bearly enough to get it started. Took it out for a ride and went ok but everytime I would stop I had the same problem and it seemed to have problems in the low end sometimes. Also a few times I would start in N and when kicked in gear would stall. Today went out to start and now with jump pack it will somewhat crank but no hope of starting. Fuel and spark are both there. With choke on it cranks even less actually stops. Seems like excessive compression. Also noticed when it was idling yesterday the hmf stainless headers were bright cherry red. I just want to ride any help would be awesome guys! Thanks.