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  1. Y

    engine or prop causing no mid rpm range

    I have a new yahama 150 hpdi 2 stroke engine on a 1988 18.6 boston whaler outrage. I can not get the engine to hold rpm between 2000 and 2900. top end is 5800 rpm and otherwise the engine runs fine. with the 17 pitch prop i kinow i am a little under proped but is it normal that under propping...
  2. Y

    under proped or what?

    I have a new yahama 150 hpdi 2 stroke engine on a 1988 18.6 boston whaler outrage. I can not get the engine to hold rpm between 2000 and 2900. top end is 5800 rpm and otherwise the engine runs fine. with the 17 pitch prop i kinow i am a little under proped but is it normal that under propping...
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