We have an 04 70cc Cat. This quad just starting having a little bog on real steep hills. It has all the works in the clutch system. It comes out of the hole like a rocket, it will pull the wheels off the ground and spin and take off all the way thru the powerband great. If you hit a hill pinned it will eat any hill up fine. But if you have to slow down in the middle of it and pin it again it bogs down. Any thought on what I need to check? It only does it on real steep hills like 60 degree inclines or more. It use to be abel to stop on these hills and take off fine. It just started doing this, this week. It's got be puzzled, I'm just starting to get this clutch thing figured out some and I really don't know what to check first. I'm thinking the rollers. They have been in there for 2 years and have about 150 hours on them.