I'm not familiar with that engine, but if the cam-to-crank timing has moved you will not get compression but you will still see the valves moving.
it would not be too difficult to turn the engine over with your hand or a wrench with the plugs out observing the valve operation.
as the engine comes up on compression to top dead center, both valves should be closed.
and as the piston comes goes back down, then just starts back up you should see the exhaust open.
also make sure you are turing the engine in the correct rotation.
and remember it is a 4 stroke so you need to be looking at the compression
stroke to start, not the exhaust stroke.
Excuse me if you know this, as I have no idea of your knowledge.