So it ran for a period after the event, albeit very poorly?
Since the tensioner is well over the 16mm drop, I wonder is that enough to let the chain jump teeth.
Could you try set timing again, put the spacer into the tensioner, and assuming it turns over (by hand initially) ok, see if compression returns and it runs ok?
Before taking the head off.
So it ran for a period after the event, albeit very poorly?
Since the tensioner is well over the 16mm drop, I wonder is that enough to let the chain jump teeth.
Could you try set timing again, put the spacer into the tensioner, and assuming it turns over (by hand initially) ok, see if compression returns and it runs ok?
Before taking the head off.
That's my suggestion, unfortunately.
Measured no compression at all. Tensioner measured fine, but I'll redo and post numbers. Bike did less than 20K km.
I have to verify a third time, but this is the timing at TDC:
Since the tensioner is well over the 16mm drop, I wonder is that enough to let the chain jump teeth.
Could you try set timing again, put the spacer into the tensioner, and assuming it turns over (by hand initially) ok, see if compression returns and it runs ok?
Before taking the head off.
If you can breath through the cylinder with valves closed, that sounds like a major malfunction! If you blow into the cylinder through the spark plug hole where does the air go? Can you hear it escaping through the throttle bodies? Exhaust? Crankcase breather? That would help narrow down the problem.