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  1. #1
    Manila, Philippines joaqslam's Avatar
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    Engine swap from 800 to 1200

    Hi..I have a 2002 GPR800 and i was wondering, how tedious would it be to swap my 800 with a 1200 or 1300 engine? what are the things I should consider? You see i just recently painted the ski and i absolutely love the hull but i want to go 4 stroke. Would any of you advice for this or against this? Of course cost is an issue in the end... anyone?
    Thanks


  2. #2

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    i heard the big issue with this is the motor mounts. and while it can be done it is just easier to buy a new hull. just what i have heard.

  3. #3
    Manila, Philippines joaqslam's Avatar
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    Oh ok... i assumed it would be the same considering it shares the same hull design....

  4. #4
    Hydrotherapy's Avatar
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    stingray is spot on the mounts are different,one cylinder less has brought the mounts back one cylinder in distance apart

  5. #5
    Autosport's Avatar
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    looks like you might have to go straight for the RXP conversion :P

  6. #6
    Moderator OsideBill's Avatar
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    There has been a member who was going to do the RXP conversion on an 800 hull he ran into issue also and opted for the 1200 hull.

  7. #7
    Hydrotoys's Avatar
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    It's not un-doable...nor is it harder than swapping an entire hull.

    It just hasn't been documented.

    Look with a flashlight at your liner, in front of the front engine mounts. See those indentions that look like an engine mount would go there? That is where you need to move the front inner mount support to.

    We've talked about it, and it would require drilling an access hole on each side of those runners to move that plate forward until you could capture it and pull it up to the new holes.

    I'd love to try it!

  8. #8
    Pistonwash's Avatar
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    Started to do it with the hurricane ski, she is an 800. The back mounts will fit just as they sit, the forward mounts you will have to cut into the runner..if you look closely there a pre-drill X's marked plainly in the runner for 1200 motor mounts to be fitted. I was worried about measuring and drilling but Yamaha already put the X's in place..you only need to cut out the existing backing plates and move them forward inside the runners. It will be some work, but very doable.

    I will still be doing this to the ski at some point..so I will picture document the modding process.

  9. #9
    Read this james you ignorant idiot

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