But did you have oil pressure before the test? If you get pressure during the test it will change the results for subsequent cylinders as it changes the overlap of the inlet and exhaust valves. I've seen it before. I would repeat the test in the reverse order before committing to mechanical issues.
If the chain is out by a tooth it runs like crap. You would 100% be able to tell the first time you fired it up if this was the case.
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