I always disconnect the air cleaner at the carb so that a partially clogged air cleaner does not affect the results. I would also conduct the test with the engine at operating temperature and would also conduct the tests both dry nd "wet"(add several ounces of motor oil to each cylinder and repeat the test) recording both numbers.
Very low compression readings are generally indicative of a stuck open or burned valve. Low pressures that don"t improve from dry to wet are generally indicative of leaking valves.
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