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  1. #1

    What should stock RPM be for GP800/GP1200

    I have a 1998 GP800 and 1998 GP1200, both completely stock. Rebuilt the carbs a bit ago, and finally got a Pet2100 tach to make sure i set the high/low speed screws right.

    Got the 1200 tuned to 7000RPM, couldn't tune the 800 since it was a PITA to get access to the screws, but the tach was reading 7440RPM so I felt like it was sufficient to leave alone.

    What kind of RPMs should I expect? Why does the GP800 get more RPMs than the 1200?


  2. #2
    Flying Scotsman's Avatar
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    GP1200 7000rpm is great GP800 dont know but its a 2 cylinder with P/V the 1200 is a 3 cylinder,Powervalves more rpm.
    Limiter on the 1200 is 7050 rpm stock.

  3. #3
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    6750 is all a stock Gp12 should turn. I am not positive what the 800 should turn, but I think it is 7000 +.

  4. #4
    Flying Scotsman's Avatar
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    Last time out in good air (mid 60s temp) I saw 7090 and 7070 a couple of times on the 97 I wonder what the 99 was turning it hit 7000 on the stock tach easy enough.
    97 is stock allmost or close enough

    Sleeper is not stock but he knows where the exhausts sweet spot is and targets that rpm thats why he is so reliable hes not creating heat and deto his porting adds fuel and cools the motor.
    its the group k way.
    I think hes right about the 6750 rev limit I think it was set at 6750-6800 rpm.

    I will swap out the Tiny tach and see what rpm the 99 is turning next time out its close to stock too

    What are the rest of you GP 1200 guys looking at for rpm
    If your not stock say so mostly interested in stock rpm.
    If you have a prop say that as well.
    Both my skis have stock impellers and run 60-62 mph.

    So how many RPM are you stock guys turning.

  5. #5
    cfgp927's Avatar
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    You are right on with the rpms for the GP800....the stock rev limiter is at 7500rpms. The exhaust ports are higher on the 800's cylinders and the transfer port timing is different than a non-pv 1200/pv 1200. The Pv's allow for higher exhaust ports, since when they are down the port ceiling is lower allowing the motor to make more torque, and when they raise up they uncover the higher port allowing the motor to rev higher to make more HP. Best of both worlds.....when they work correctly.....
    Mike

  6. #6
    cool... thanks for all the replies guys... especially with all my other "newb" threads, much appreciated. I finally feel like i'm getting edumacated re: these jet skis.

    Pretty happy with the ride of the 1200, not looking for it to do much more than what it's at. The 800 gets out of the water quick, but the bow tends to just bounce and bounce all day long on the water. Iinvest in a ride plate? Which one?

  7. #7
    cfgp927's Avatar
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    The same plate works well for both....Riva limited edition plate (stay away from the "groovy" plate) or R&D plate with Group K speed cut. Those two plates are the best for top speed. There are some other plates out there that are better for rough water and CC racing. The Riva and R&D are good "all around" plates....that tend to net the best top speed numbers.

  8. #8
    Bought a GPS yesterday, and the water was extremely choppy so wasn't able to get good top speeds, but with the chop I was able to get 53.3MPH on the GP1200 and about 50MPH on the GP800. Both are completely stock, what should I expect max out of them on a flat water day?

  9. #9
    Flying Scotsman's Avatar
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    Just under 60mph or just over 60mph.
    59-61mph

  10. #10
    Flying Scotsman's Avatar
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    Your spinning more rpm than stock so 62-63mph on the 1200

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