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  1. C

    1990 Johnson 25 hp

    Just removed the Cylinder Head Cover and Head and the found no scarring on the cylinder walls. Suspected a Head Gasket problem and found lots of corrosion possibly breaking the gasket seal. Also found carbon build-up on the piston heads and the Head itself. Thermostat is corroded and shot...
  2. C

    1990 Johnson 25 hp

    I am getting ready to pull the power head and see where my compression problem is. Any likelihoods? Also, I need to find a cover/screen to go over my Carb air intake. I have had the boat for 3 years, and it has never had one. Can't seem to find any.
  3. C

    1990 Johnson 25 hp running rough

    Just tuned up Carb, hoses in good shape, adjusted carb to specs, new gas with correct mixture(50:1), and replaced spark plugs. Ran motor for 15 min., pulled plugs to find the bottom one completely black and wet, and top one slightly black and wet. Plugs were getting black and wet prior to Carb...
  4. C

    90 Johnson 25 J25RES stalling

    Have had this motor for 2 years. No problems until mid summer last year when motor would start and then sputter out. Now determined that I can keep it running the most of the time by keeping the choke slightly out, but it still sputters and cuts out at higher and idle rpm's. Have to put it in...
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