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compression test should be done on a warm engine: with the plugs removed...ground both plug wires and screw in the compression tester hose...with the throttle held wide open crank the engine with the starter until the gauge needle stops moving [should read over 120 psi minimum]
blowing back through carb can indicate a super lean mix [clogged jet or massive vacuum leak] also could indicate a need for a larger pilot jet [not air pilot]