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  1. #1
    TyGeR's Avatar
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    Engine swap question, advice needed

    Hello, from my other post I picked up two 92 Yamaha Waverunners that have 650 engines in them. This weekend I have one of them running good and found that I need to rebuild the carb on the 2nd and it should be good to go. I'm going to order the rebuild kit tonight or tomorrow after a bit of research to make sure I get a kit with everything I need.

    Now today I came across a deal on a pair of 96 Yamaha Waverunners that have 800 engines in them but both engines are bad. From the pictures the body style looks very close to the size 92s I have. My question is, would the 650 engine out of my 92s drop into 96 hulls. I know its a downgrade in size, but the 96 hulls look to be in almost perfect shape. My 92s need a few small holes on the top filled (where the other owner had some lights and speakers mounted) and the seats need to be redone. They also could use repainting. I think the swap would save myself a lot of work and time vs repairing/painting the hulls on my 92s.

    Being I'm new to the jetski world if its anything more then just unbolting and pulling it from one ski and dropping it into the other I probably dont want to try it at this time. But if all the mounts would line up and I wouldnt need to fab anything I think I can do it.

    So the big question is, would the 650 engine fit and bolt into the hull of the 96 waverunner that currently holds a 800 engine, without having to fab any custom parts? If I didnt say it before, all 4 skis are 2 stroke.


  2. #2
    powerstroke specialist mikegp's Avatar
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    correct me if im wrong , but i don't recall a 800 on any waveraider .as far as i remember they were 760 and 1100 .

  3. #3
    TyGeR's Avatar
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    ok mikegp, sorry if I gave wrong information. I only used the info the seller gave me. After searching around for a bit I found this image that is the same picture of the ski the seller posted. From what I can tell now it looks to be a 1999 GP800. I think this is still a 2 stoke engine. Not sure if my 650 engine would fit into this 99 Hull.

    Also looking at a few youtube videos of these skis, the lower half of the hull and the foot areas look almost identical as mine. The top noise area and the seats are different shape, looks like the back end of the ski where the seat latches is a bit taller, I would assume for the larger engine. This 99 might be a lot larger then my 92 and I cant tell because I'm looking at photos. I was hoping to save my self some trouble, but I might be making more problems for myself instead.

    thanks for any help.

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  4. #4
    TyGeR's Avatar
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    im guessing that sense no one was able to say for sure that it is possible that it probably wont work......

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