I'm not a boat guy type of question re: HP

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    I'm not a boat guy type of question re: HP

    Yea I know, not a boat site. But boat forums suck

    I have a 12ft 1968 aluminum boat w/ 15hp Johnson. Markings to indicate max HP are long gone. Goes ok, but is a '76 Johnson and leaks out propeller, sputters at mid range rpm and is simply just old and tired.

    Anyway, picked up a nice 20hp Yamaha for cheap but now I'm hearing that some people don't think that's a great idea whatsoever and it's a good way to cap size or drown.

    So I guess my question is what's the biggest size motor you've ever had on a 12 foot aluminum and how did it work out for you?

    Worth noting that I go on inland lakes for the most part and the boat will never see open water

    #2
    You'll be fine. Its probably over the rating, but a 20hp isnt going to make you kill a bus load of nuns. We always ran 9.9's or 15's. Usually ran 9.9's so you could avopid having to register the vessel. Neat trick is most 15's are just bored and tuned 9.9's so the cowlings swap...

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      #3
      i looked into some tiny bass boat stuff and that is on the larger size for a motor

      but take it easy on the turns and it should be fine right?
      Byro-
      Nothing is for sale man, I’m a curator of the finest junk.

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        #4
        Ive done 40 on a 14'. Youll be fine

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          #5
          Never had an aluminum boat, but a 14ft skiff with a honda 50, because the Yamaha 30 wasnt enough powah.

          If its magable weight wise, I'd run it. Right now my 19ft is "rated" for a 140. But I have a 150 merc hanging off the back... which is the same block/motor as the 225. Love it.

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            #6
            50 to 80HP should be fine.

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              #7
              I had a fresh 9.9 on my 12'. Based off that 20 would be fine, but be mindful of wave size and turning radius.

              Just because it has power, doesn't mean you need to use all of it...

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                #8
                Originally posted by TheFlyingDildocupine

                You know it doesn't work that way
                Haha, yeah. But if it means dumping your boat, losing all your fishing shit, spilling your beer, then likely having to swim a good bit to get to shore, then at least think first.

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                  #9
                  40HP on the 13' Whaler. If its calm enough, it moves right along.

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                    #10
                    As long as they weigh close to the same you are okay. See youtube for big dumb outboards on tiny boats, pretty much does nothing but 5 mph wheelies.

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                      #11
                      I agree, boat forum people are dumb.

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                        #12
                        Around here a lot of guys weld on flotation pods to the transom for more stability. They swear by them.

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                          #13
                          Sell it and do a jetski conversation on it.

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                            #14
                            20 hp on 12' will be completely fine. adjusting the mounting height of the motor will have huge gains on that size boat. if the outdrive is too long/ mounted too deep, your leaving speed & efficiency gains on the table.



                            Originally posted by not2hye View Post
                            I agree, boat forum people are dumb.
                            So much this^

                            Boat people make the towrig section rating nazis here seem like reckless wildmen. they're a bunch of pearl clutching bitches when it comes to modifying anything or pushing ratings etc...

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                              #15
                              I hang a 35 off the back of a 14x48 flat bottom aluminium. I'd go bigger but I'm afraid the boat will fall apart. Pretty sure it was only rated for oars.
                              Time is the only real currency

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