SOHC.co.uk Forums > CB650

posable disaster with my 650

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RickyC83:
Ok so removed the top of the head. Exposing the cam.  The engine will now turn freely by turning the bk wheel slowly. The cam chain is in tacked but mega loose. I'm thinking it has slipped on the bottom cog and the engine wouldn't turn cos a valve was hitting the piston??
Sound right to anyone?

mickwinf:
It does sound like a valve hitting piston so chain off sprocket or cam timing a possibility. also I had a similar problem on a 550 where something was catching the alternator and stopping it from turning so worth checking that also. Oh and never believe the previous owner, they forget/ lie/ don't know what happened before.

RickyC83:
Timing was out. I've just finished lining everything back up. Had a play with the tensioner which seems to be working now. But still dosnt seem as tight as I wuld expect.

fisjon:
I could be a dislodged or broken cam chain slipper or even a broken cam chain adjuster. If that has happened then the chain could jump a cog on the crank and if that happens when the engine is running then you have a disaster.
I would whip the head off and have a good look.

RickyC83:
Done mate.
Cam timing all surted valve clearance all set. Still won't start getting the odd pop but nothing else. Will work on carbs at week end. Also gona get compression checked tomorrow.

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