Tensioner for cam chain just pushes against a plastic sleeve (cam chain guide). If you can remove tensioner unit and drill tap a bolt right through it that you could wind in to keep tension with a lock nut on outside...just a thought as I managed to do this with a bike in the past.
Just a word of warning, if you have had severe vibration the cam chain guides may now be cracked and "could" break off into the case. They are plastic, but you will have no guide and hence no tension...But they are fairly tough so hopefully they are OK.
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