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1996 25hp msh no power, hook up tac?

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  • 1996 25hp msh no power, hook up tac?

    I recently purchased this motor used.
    It starts and idles fine, I let the motor warm up a little and pulled a compression test on both cylinders, was 95 both cylinders.
    My concern is when I put it on my boat (flatbottom 14ft 42 alum ) it does not seem to be reving all the way up when wot, and it will not plane my boat with just me in it. I had a 15hp yamaha on this boat and it would plane the boat and run about 17 mph. I ran this motor and at wot it runs 13.5 mph (used gps)
    the PO put a stainless 3 blade prop that is 13 pitch. Is this too much pitch for my boat? The boat is a little heavy made, but this motor should push it to at least 25-27 mph and plane. The boat is a 2005 southfork boat company boat, so no hook in the chine or anything.
    How do I hook up a tac to the motor? what is the operation rpms of the motor?
    Should I get a lower pitch prop?
    Thanks

  • #2
    call around, find a dealership with test wheel YB-1621.
    have them spin it up with that wheel.
    if it turns 4200 or so the motor is making its rated power and its time to play with props.
    if it wont spin it up the motor will need attention.

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    • #3
      What did you find out?

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