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  1. #1

    GP1200 best bang for the buck mods?

    I have 2 stock 98 GP1200s. I had the one for about 6 months along with a turbo honda r12x. I picked up another GP1200 last week cheap and its in great shape. they are both stock. and my turbo honda just destroys them at high speeds. Any simple/cheap upgrades I can do to them to just waken them up? I do not wanna go crazy as I don't use them that much, but it would be nice to have a little extra power in them.


  2. #2
    Mpeavler's Avatar
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    1. Milled stock head to increase power output (150) psi
    2. Ride plate/ intake grates
    3. Remove stock F/A and get some aftermarkets on there
    4. Prop if you add the above

  3. #3
    improvised tmg97gp's Avatar
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    I got that riva Ride Plate for a 97-99GP for sale in the classifieds.

    I think its the best plate ever made for a GP.

  4. #4
    Flying Scotsman's Avatar
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    Best bang for a buck would be a toss up between

    Raising comp
    Adding an intake grate and ride plate

    Raising comp makes more power adding a grate and plate with shims gets the ski up out of the water so you have less drag on the hull and you can turn more rpm.

  5. #5
    cheatin' piston popper addicted's Avatar
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    somethings definitely wrong. the gp's should be equal to or slightly faster than the Honda on smooth water, and out hole shot it by a mile.

  6. #6
    it will pull the honda down low. but at like a 20mph roll, it destroys the GPs. The honda is modded slightly with a tuner and hits about 16-17psi.

  7. #7
    Flying Scotsman's Avatar
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    What will the GP gps and what will the Honda gps.

  8. #8
    no idea. they both say around 60 on the speedo (which we all know isnt right). but the honda rolls by the GP at anything over 20-30mph and at flat out. the honda pulls around 73 (speedo, not gps) and the gp hits 58-60

  9. #9
    Flying Scotsman's Avatar
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    1st thing we need to figure out is are the GP's both slow or is the Honda fast.
    I have honestly only run against 1 Honda who thought he had a fast ski and he wasn't fast at all lol.
    Get a GPS and GPS your skis you should GPS about 60-61 mph if you have an early 98 you might be at 58-60 mph.
    Buy an aftermarket tach as well its a must have to do any mods.
    Buy a [email protected] ride plate and a [email protected] intake grate,then shim the front of the plate so it is just above the intake grate.
    Buy a aftermarket head or have yours cut so you have 150 psi compression.
    This should get you to about 63 mph in good conditions.
    Check that you have a 5 deg nozzle in the pump early gps had a 0 deg nozzle.By now you will need to upgrade your impeller because you will be cavitating pretty bad with the stock one.
    With raised comp a shimed ride plate an intake grate and a properly pitched YD SC XO impeller you should run 65-66 mph and get there pretty quick.When you get your GPS give it to your buddy to try so you know how fast he is so you can make your ski faster than his.

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  11. #10
    cheatin' piston popper addicted's Avatar
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    Im not familiar with modded honda speeds, but i think upper 60's is reasonable.

    plate, grate, prop, nozzle, and trim tabs are going to net you the most without touching the motor.

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