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    Briggs 17.5 hp low compression blows oil out vent

    I have a Ariens 42" (AYP) manuafacture. The mower is in immaculate condition. I rebuilt the Niki carburetor and it runs fine but it blows oil out the vent into the intake. I checked the compression it was about 80psi which is low. Would a bad head gasket cause low compression and depressurize...
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