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#45295
Mumbles
Participant
    quote djeady:

    How do the crank seals,which are below the piston and head assembly affect compression which is entirely inside the cylinder head?


    They don’t. In a two-stroke motor, atmospheric air pressure enters the cylinder thru the exhaust port every revolution while doing a compression test with the motor mounted on a stand. Leaky seals will only affect the operation of the motor as they will cause a lean condition if leaking air in or poor running if leaking the fuel/air mix out.