- Joined
- Jan 8, 2011
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- Location
- Lake Charles, La
- First Name
- Joel
- Last Name
- Sims
Did you by any chance remove and inspect you cam chain tensioner? If you pull it off and the tensioner does not spring all the way out that could be the crux of your problem. You can also check to see if it is still good by removing the nut on the back of the adjuster, inserting a flathead screwdriver into the hole and turning the screw inside clockwise. It should be under tension and when you remove the screwdriver it should audibly snap back.
There is a spring inside the guts of the tensioner that can break and allow the cam chain to rattle around which makes an awful sound. This happened recently to my on my CRF450X. I removed it and carefully dis-assembled it, noting the direction the spring was wound. The spring was broken about 2 inches (5cm lol) from the external hook and I was able to use the shortened spring by bending a new hook to the end.
There is a spring inside the guts of the tensioner that can break and allow the cam chain to rattle around which makes an awful sound. This happened recently to my on my CRF450X. I removed it and carefully dis-assembled it, noting the direction the spring was wound. The spring was broken about 2 inches (5cm lol) from the external hook and I was able to use the shortened spring by bending a new hook to the end.