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  1. J

    85 Yamaha 40hp

    Motor will not get up too speed. Max speed I've got is 9mph, took the boat in and they checked it out and without a dyno test they couldn't find anything. Good compression, new spark plugs, new fuel lines, prop is good. When I have it full throttle 2600 rpm is the max. It seemed like it would...
  2. J

    1985 Yamaha 40hp

    Motor sound great and runs but even at full throttle will only go between 5-8mph. I changed the fuel line thinkin it was old and ethenal had dissolved the line. Could it be an impeller issue? Also noticed that the water outlet hole is more spraying water rather than a nice stream. Would that be...
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