Reply To: THOR single mixing valve/carb questions

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February 15, 2026 at 5:37 pm #304679
Buccaneer
Participant

    US Member

    It’s the crankcase pressure needed to get the poppet valve working.
    On can have decent compression, but poor crankcase pressure.
    You should be able to hear the valve operation when pulling
    the engine over.

     

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