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  1. #1
    Member
    Join Date
    Dec 2004
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    Des Moines, Iowa
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    419

    Convert 25HP yamaha to a Jet (new lower unit needed)?

    I somoked the lower unit on my 25 HP Yamaha model (25MSHW) and was wondering if it is possible to get a Jet lower unit for it instead of a prop lower unt? Also, If anyone has either a prop or Jet lower unit for sale, please let me know.

    Thanks,
    Chris

  2. Member kk4iz's Avatar
    Join Date
    Jun 2004
    Location
    Clanton, AL
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    4,351
    #2

    Re: Convert 25HP yamaha to a Jet (new lower unit needed)? (bassmasteria)

    I don't think you want the jet LU.Your hp would 10 hp or less. Just my $.02


    12 lbs 9 oz caught on 4/28/1975 Lake Eufaula

  3. Member
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    Jun 2004
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    Poplar Bluff, MO
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    1,266
    #3

    Re: Convert 25HP yamaha to a Jet (kk4iz)

    You'd end up with about a 17.5 hp with a pump. They knock off about 30%. Depending on the size of boat you might want to go with a bigger motor, then the jet.
    2018 Ranger RT188 Custom Jet
    150/105 Evinrude ETEC Jet

  4. Member
    Join Date
    Dec 2004
    Location
    Des Moines, Iowa
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    419
    #4

    Re: Convert 25HP yamaha to a Jet (new lower unit needed)? (bassmasteria)

    Thanks guys. Most of lakes we use the boat on are no wake so we shouldn't have a problem. The skinney water advantage would be priceless. Would anyone know the part number of the Jet lower unit I need. The motor is used on 15 ft flat bottom john boat.


  5. Member
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    Jun 2004
    Location
    Scottsdale
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    2,305
    #5

    Re: Convert 25HP yamaha to a Jet (bassmasteria)

    I used to run a jet on a merc 200 when I lived in Oregon. I don't even know if they make one for a 25hp motor. You lose quite a bit of hp and the pump will suck stuff into it if you get too shallow. With a big motor you can get on plane and run in about 6 inches of water but that is at full speed. It might be a lot cheaper just to use aluminum props and keep a spare on board.

  6. Member
    Join Date
    Jun 2005
    Location
    New Haven
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    #6

    Re: Convert 25HP yamaha to a Jet (gleninaz)

    I can help you out with your jet purchase, but you'll also have to raise your transom about 5" or so. The jet shoe needs to be installed where ti is level with the obttom of the boat. Also, what type of boat? What type of bottom? It won't work well with any type of built in setback, or a deep V.

    Aaron

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