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  1. #1
    Cadet
    Join Date
    Aug 2004
    Posts
    28

    Default 1990 85HP Yamaha Question

    I was wondering what the RPM should be for my engine at wot? I have a 13 1/4 x 17 prop and was thinking about going to a 19 or 21. Going to install a tach because the engine sounds like it's running too high. I am getting 25kts at 2/3 throttle and 31kts at wot.

  2. #2
    Lieutenant Commander
    Join Date
    May 2004
    Location
    Jackson,TN.
    Posts
    1,657

    Default Re: 1990 85HP Yamaha Question

    Install the tach first. 5800 woild be ideal.

  3. #3
    Petty Officer 2nd Class
    Join Date
    Oct 2005
    Location
    Denham Springs, La
    Posts
    122

    Default Re: 1990 85HP Yamaha Question

    I have a 85hp on a f-80 skeeter 15'-1/2". WOT I'm running 5100 at 52mph. 19pitch prop

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