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  1. P

    1974 40 hp issues

    Originally this motor was pushing my 15 ft fiberglass tri-hull about 7 mph. Found a bad plug wire. Cleaned carb. Changed plugs. Also swapped props(believe old one was slipping). Compression is approximately 120 in both cylinders. Throttle does open fully on water, in gear. Took back out...
  2. P

    74 40 hp gear case issues

    Just installed this engine and took it out for a test run Sunday. Power head wise it seemed good. Idled good ,revved good. All in all pretty smooth. Here’s the issues. First off it seemed to be a total dog. At WOT the boat barley moved. I think top speed was around 8 mph. The motor it replaced...
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