Home › Forum › Ask A Member › Johnson 3HP JW-17 Compression woes › Re: Johnson 3HP JW-17 Compression woes
July 19, 2018 at 6:02 pm
#79728
Compression should be about 80psi. But those motors are fussy about what kind of gauge you are using. I can’t imagine losing all that compression just replacing the gasket, assuming you at least cleaned the surfaces and bolted it down somewhat tight.
Have you pulled the flywheel? I suspect ignition trouble (cracked coils??). Never mind it has spark–the great deceiver.