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I wonder of the merits of compressing the engine with air pressure. Hmm. I actually go the other way and test an engine with a suction guage. It eliminates the bent valve scenario. It needs to hold negative suction numbers for at least 15 minutes. Or is it possible none of the valves are bent but u may have a couple of suspect seats. The bore probably needs a plateau hone job. The average stone sometimes dosen't quite seat the ring(s)....trikes
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