2002 300ex timing chain question
I bought a used 2002 300ex for my son. He has been unable to ride as of yet due to some repairs that need done. After completing all repair we got it running, and it seems to run great, right up until the time you shut it off. It seems every time you shut it down the timing chain jumps off the sprocket. The tensioner is out the whole way, and the chain "seems" tight, but not sure how tight it should be. I'm more of an auto mechanic. I'm thinking the chain is just stretched to the point that it is jumping, but also thinking maybe the tensioner is weak.
I was wondering if anyone else has had this problem or seen this before with a 300ex.
Any and all help is greatly appreciated.