Compression tests 90 -100 on all cylinders.
Conditions for this test are important.
-Throttle and choke wide open. All spark plugs removed.
-Either a very fresh battery or kick start for the highest reading.
-The gauge matters, too. A long large hose adds volume to the cylinder and effectively lowers the compression ratio yeilding lower numbers.
-Also a wet test (squirt of oil in the cylinders) after the dry test can tell you if your rings are seating properly.
Why do you think the timing chain jumped? Is there a problem with the cam chain tensioner?
I don't know this for sure, but, I thought the pistons would hit and bend the valves with a skipped chain.
Can you get the 2-3 ignition timing adjusted? Or, does it have the same problem?