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Thread: gpr engine swap

  1. #1

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    gpr engine swap

    Has anyone put a 4 stroke engine in a gpr???????


  2. #2

  3. #3

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    Ya someone should post that in the yami section too.. Most yami guys probably didt see the awesome project yet.. Congrats mark

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    Moderator OsideBill's Avatar
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    Sponge I agree with you when you see it you see a Yamaha. When you hear it you say "WTF"

  5. #5
    Flying Scotsman's Avatar
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    Bill why dont you drop a rxp motor in that 99GP hull.

  6. #6
    Moderator OsideBill's Avatar
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    Mark had to shoehorn it in the GPR hull I doubt I could squeeze one in the 99 I would like to to put one in the big ski though. I will wait for Rapidacceleration to finish his and see what kind of numbers he posts I am sure it would make a strong reliable stable high mileage multi passenger cruiser.

  7. #7
    Hydrotoys's Avatar
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    Measure the engine opening Bill, and I'll check.

  8. #8
    Moderator OsideBill's Avatar
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    Mark,
    I like your first suggestion of powering up the Tanker. All I need now is wrecked RXP and a good divorce attorney

  9. #9
    Me Hahn and Joe H204YOU's Avatar
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    My tig mans is into rock crawling so he opened up his own fabrication shop for anything that crawls,but his personal projects are all suzuki samari's.In one corner of his shop he has about 10 engines laying around in various stages of disassembly.he says the little motors are really tough and although crawling wouldnt be like sustained high rpms the rev limiters are set around 6800.The head looks like its hemispherical in desiegn with fairly large valves and decent ports.Heres the kicker.Its very compact actually small in size 1300cc 4cyl with aluminium block and steel sleeves.Next time I go I'm gonna take a closer look,Im wondering if you pull the sleeves out how far you could bore and nickicil the cyls. An over sguare motor with a short stroke would respond really well to a turbo.Im pretty sure it would be very easy to get to 1700 -1800 cc's and a reliable fast winding 350hp.Oh I forgot light-wieght.Ya I know it would take a lot of fabrication,and a real tough crank,and electronics that are way outa my leage,but I do think its worth looking into Ya never know till ya try

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