Worse than that I suspect. OK, here’s one for the clever people. Did a quick check today and it seems to be an errant piston. It’s not fulfilling it’s primary obligation of going up and down.
Well, not strictly true, it’s gone down at some time, but refuses to come back up.
The right hand piston moves, so it’s not a broken cam chain. If it was stuck at the top I would suspect it’s detached from the rod but surely the rod should be trying to push it up.
Is it possible for the sprocket to come off the camshaft, but everything sounds ok when turning it over.
Maybe it’s been converted to a 375cc single.
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