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  1. M

    Popping and revving?

    I just put a new head gasket on my Johnson 45 HP commercial, pressures are 145 upper, 135 lower. Engine is running at normal temperature and is now popping for some strange reason. Check out the video. Plugs are brand new and clean, mixture is new gas and 50 to one, I have some Seafoam in the...
  2. M

    Low compression on Johnson 45hp pull start.

    Hello, new to the forum; I have a '91 Johnson 45hp commercial pull start motor. I pulled the plugs and opened the throttle to full. I hooked up a compression tester and get 30lbs on the top cylinder and about 90lbs on the bottom. I pulled it about 5 times and read the gauge. Should I be...
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