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  1. M

    1990 Johnson 300hp GT V8 smoking

    here’s what I know… Smoking white smoke (not steam) Compression 116-118 all cylinders Getting worse All plugs and piston tops look the same Last night would barely get on plane. Almost like running on 4 cylinders Idles rough, with a “PUH” every few seconds Lots of smoke when starting Has 2...
  2. M

    ‘90 300gt V8 surging and smoking

    Just started doing this. Compression good on all 8. Good impeller. Plugs changed last fall. Tried sea foam. Speeds up and slows both on idle and plane. Smokes a lot when started and when running in “bog” mode if that makes sense. Harder to start than normal. Used to start on 1st key turn once...
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