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Even with only 90psi compression, I would certainly think it would still be firing. How many miles are on the engine since the rebuild? Is it broken in yet? Triple-check that the plug is actually firing by looking at the spark and double check that the cyl is getting fuel (if its not firing the plug should be wet right?). You can also put a IR thermometer on the exhaust manifold to see if its firing. Running it moderately hard will also wear off any surface rust that may have formed on the valve seat(s).
I wouldn't worry about crap until it has a few hundred miles on it. New motors leak until the rings are broken in.
Last edited by blpetry; 02-03-2018 at 11:10 AM..
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