I just bought a 1996 300 fourtrax 4x4. Had some head noise, so I started looking into the head and the chain tensioner was broken. So I got a new one, the chain guide (exhaust side), new rocker arms and everything that goes with that. I also bought a cam sprocket and chain. I am having issues with getting the centrifugal clutch off. Any suggestions???? And do I need to take anything else off other than the oil pump to get the old chain off and new on????