Reply To: ?????? Question Johnson QD-16

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May 27, 2019 at 12:24 pm #176121
Mumbles
Participant
    tinkerman wrote:

    I got to thinking maybe the crankshaft seal could be causing low compression.

    The condition of the crankshaft seal will minimally, if at all, affect the cylinder compression in a two stroke motor. It’s there to maintain the pressure/vacuum cycles in the crankcase itself. The sealing capabilities of the rings to cylinder wall and the condition of the head gasket are the major players in determining cylinder compression.