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  1. #1

    97 Yamaha GP1200 W/ Triple Pipes

    Hello all, this is my 1st post and hopefully I can get some more performance info on this site rather on pwctoday! I recently bought a 97 Gp1200 that was totally decked out, I got a hellofa deal on it too. I just bought some triple pipes for it and I want to know what a good, reliabe set-up would be for it. I have read all of the info on the Groupk website and I've got some questions. Would it be wise to do everything they say in the article?

    Heres what I have so far

    -Riva adjustable cdi
    -Riva pump gas ported cylinder and cases
    -New hot rods crank
    -New pro-x pistons
    -fluid balancer engine coupler
    -Riva girdled head
    -Buckshot 46mm mikuni mod carbs
    -V-force 2 reeds
    -Riva reed spacer
    -Aluminum charging flywheel
    -FP Triple pipes

    Group K says I should use a stock head and stock carbs that they will machine and jet accordingly. I want to go 70mph with this boat but I also want some reliability and I wanna run on 93 octane fuel. Does anyone have the group k kit? How does it run? Thanks a bunch!


  2. #2
    Pistonwash is the GP expert, send him a pm.

  3. #3
    ....back from the dead.... J-ME's Avatar
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    dav_d man, Flying Scotsman and Pistonwash all will able to help you out.

    Get your paper and pen ready.

    You will NOT be able to run straight 93 octane fuel.

    How much is some reliablity?

  4. #4

    Join Date
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    well if you can find it blue cdi box,(early one was purple) have never had luck with aftermarket chargering flywheels(mag's to stronge,end up bbq stator,triple are neat,BUT if you what to ride not wench&tweek,stay stock pipe(but you can use tail section off 1100 ,blancers rare
    if can't get hold of mike,the group K page has some great info

    later cd

  5. #5

    Join Date
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    Get a r&d ride plate and send it to group k and let them mod it. I was stuck on like 68mph and when I recieved the plate back it put me just over 70mph. I was the happiest guy on earth that day.. This was in 99. Also boat did run great on 93octane and with the stock carbs.. Did have triple pipes too..

  6. #6
    Flying Scotsman's Avatar
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    Some have run pump gas I tried and failed.

    I never got the speeds I wanted had I had another $4000-$5000 I would hve got well over 70mph but thats another story.

    Looking at what you have I will make some comments based on what I have read and experienced.

    -Riva adjustable cdi
    -Riva pump gas ported cylinder and cases
    -New hot rods crank
    -New pro-x pistons
    -fluid balancer engine coupler
    -Riva girdled head
    -Buckshot 46mm mikuni mod carbs
    -V-force 2 reeds
    -Riva reed spacer
    -Aluminum charging flywheel
    -FP Triple pipes

    Cdi I had a total loss but Riva is good choice.
    Riva ported cylinders and cases good choice also
    Good crank
    Good pistons
    Balancer hard to find I have only seen pics.
    Head shoot for 150psi
    Carbs I hear can be tricky BUCKSHOT
    Reeds best I have tried
    Spacer good choice required also
    Flywheel should be radiused and laped not sure of issues mine did not charge.
    Pipes You will love the pipes without a dought.

    With pipes and porting you should be able to pull a j prop but I would steer away from pump gas you will have a lot of load on the motor.

    I am learning from these guys on a daily basis Pistonwash could help but I know he may not post.( familly ).
    Dave d man is full of knowledge.
    Kansas GPR on riva site also.
    Dont know if Jeff is on Greenhulk or not.

    For now My 99 GP1200 is just broke in with 170psi wil be lowering comp in a couple of days.

    Waiting on UPS to make the change.

    With the old motor it was running 61.9 on gps will be shooting for 63mph on stock motor.

    Will be going up for sale when I get it back to stock.

    SCOTT............

  7. #7
    As for the prop set-up, it has a skat-trak Magnum 12 vein pump on it. It has both the R&D intake grate and ride plate too. I don't mind wrenching on the ski because I know my gp1200 forward and back but I dont want to have to mess with it all the time. Group k said they got 70mph on pump gas, is this a false statement. Also has anyone hot their carbs re-jetted by group k?

  8. #8

    Join Date
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    one other thing that comes to mind,has hull reinforce kit been install?
    97 were bad about cracks,even without jumping

    later cd

  9. #9
    subarupartsdude's Avatar
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    By the way Metal,welcome to the forum.

  10. #10
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    I believe Group K's statement about 70mph on pump gas. Their work performs as advertised. I used to run carbs that were modified by Buckshot to 46mm. I did not like them because I never could tune out the midrange bog. When I went with the GK sleeper kit, I bought some used stock carbs and let GK jet them for the sleeper kit. The jetting was spot on. If the temperature changes drastically I may have to dial the adjustment screws less than a 1/4 turn either way if I want it to be running perfect.

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