Good to hear that the problem with your engine is about to be solved
Funny though... same problem with a BMW engine as was the cases with the Japanese bikes in the 70:ties and 80:ties (even newer?)... (cam-chain-rattling)
The cause for a rattling/slapping cam-chain on the Japanese bikes where two folds according to my mechanics:
- lengthening of the cam-chain
- wearing of the tensioner
Usually one needed to change the cam-chain when the tensioner could no longer stretch/tension the cam-chain...
If the F650 is anything like to older Japanese engines, like Yamaha XT-600, TT-600, Honda CB750, Kawasaki Z400-1100, Suzuki GS500-1100 etc checking the cam-chain for wear might be a very good idea.
Last edited by dc lindberg; 31 Dec 2010 at 15:32.