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Timing of cam chain correct? (solved)

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CB-500:
Hi everyone.. Hopefully you can help I’m coming to the end of an engine rebuild on my CB500K0. I’m having problems with setting the cam chain tensioner, the engine now has a new cam chain and new tensioner blade.The tensioner spring adjustment mechanism looks good and works fine on the bench, the tensioner spring adjustment works fine when fitted in the engine. The issue occurs when the cam chain is fitted to the sprocket on the camshaft, the engine is set at CYL 1 compression 15 degrees past TDC but the tensioner spring adjustment screw will not turn either way (obviously locking nut loose). It appears that the tensioner remains in the fully backed off state set for fitting the chain to the sprocket, it’s almost as if the new chain is too tight which is holding the tensioner in the fully backed off state. Am I reading this thread correctly that a new chain and tensioner blade will do this and needs some running until adjustment is required?
Many thanks

Bryanj:
New chain and new tensioner can mean little movement, can not repeat too often DO NOT turn that slot in the screw with any tool

CB-500:

--- Quote from: Bryanj on April 06, 2022, 09:05:01 AM ---New chain and new tensioner can mean little movement, can not repeat too often DO NOT turn that slot in the screw with any tool

--- End quote ---

Thanks for the reply.. as per the manual I was expecting the tensioner spring to self adjust automatically from the fully backed off state held for installation. I was concerned when the tensioner spring didn’t self adjust at all when the locking nut was undone. I have only lightly manipulated the adjust screw to have an idea of what the problem could be, but the tensioner remains in the fully backed off state. Unfortunately the service manual doesn’t mention anything about this scenario with new components fitted. If this is normal for new cam chain and tensioner blade is it just a case of backing off the lock nut although the tensioner doesn’t move just retighten the lock nut and run the engine for ‘X’ amount of miles

Trigger:
If it has been turned or forced, there could be missing teeth, or bent teeth. It is totally automatic. Here is a picture so, if you take the plate off you should see if there is any damage and if it is sliding ok.

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CB-500:
The tensioner mechanism looks good and turns freely and spring adjusts on the bench the same as when it is installed in the engine. The problem only occurs once the chain is fitted to the cam sprocket and camshaft, My worry is if the new cam chain is too short making it too tight

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