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  1. #1
    I wanna go FAAAAASTer!! CDW78's Avatar
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    Exclamation Another Newb, 1999 1200GP

    Hi all
    New to the forums as well as the sport.....

    ( is there a newbies guide for jet skiing or one of those "jet skiing for dummies books ? ) I could use one, for sure!!

    I purchased a Gp1200 for $500 - guy said it was running a bout a YEAR ago, but has been just sitting ever since.
    I thought with it booking for about 3K it was worth it, and if nothing else, part it out. I'd really like to get it running right, but wont spend the price of a new one to do so!!
    ( I know sitting this long couldn't be good for it and what had been done before being left )

    He also said it had low compression on one cylinder.

    I don't have the ski right here with me, yet, but would like some good info to get started with, if any one wouldn't mind.

    ( Ive downloaded a service manual for a 2000 GP1200R, but noticed some differences in the engines, or does this manual pretty much cover the basics for this engine ? )

    Thanks in advance and glad to be here


  2. #2
    Flying Scotsman's Avatar
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    You need the manual for a 97-99 GP
    Stock compresion is 120 psi

  3. #3
    1131 Adam E.'s Avatar
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    Send me your email. I have the 97 GP1200 manual as well as the parts catalog.

    Adam

  4. #4
    I wanna go FAAAAASTer!! CDW78's Avatar
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    Sent PM with email - thanks a lot !

    If been wanting to get a ski since I was about 18 or so, almost 32 now, but when ever Ive had money to burn, always end up buying tv's or a new car or some other kinda crap, so I finally said to heck with it and got this one... with out a lot of money to burn. Guess well see what happens

    Thanks for all the great info, for me directly and just reading other post!!

    Whats the first thing I should do when I am able to really start digging in to this thing ?

    EDIT -

    Meant to ask ( posted to the old cart thread but never got any responses )

    Im wanting to build a cart ( wood or pvc, which ever is best ) can some one give me some measurements on whats a good build to support this ski?

  5. #5
    Flying Scotsman's Avatar
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    What are your riding conditions and what do want the ski for.Some like to go fast some just want to get from a to b.
    I personally like to go fast so I focus on speed mods.
    If you want to modify your ski to handle or for speed or for both you set it up a little diferent.
    If you want to work on going faster than stock the first thing you want to get is a gps to check your top speed then you will need a tach to see when your rpm decrease or increase.Stock speedo and tach are not accurate enough.
    Stock 99 should be 60-61 mph on gps a stock 99 should be able to run 65 mph on just hull mods.
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  6. #6
    I wanna go FAAAAASTer!! CDW78's Avatar
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    Well, for right now, just getting it to run good will be fantastic, but stock / 60mph would be plenty!
    Later on as I get more into and learn alot, I will def. want to go faster and handle better.

  7. #7
    Flying Scotsman's Avatar
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    Check the comp then assuming it is bad pull the top end.Its just as easy to pull the motor and then your not trying to put the cylinders back on still in the ski.Find out the bore size and check for damage.
    Stock bore is 84mm stock pistons are art.Lots of aftermarket pistons to choose from.You can bore just one cylinder but you are better off keeping them all the same size to keep the motor ballanced and you dont want to run diferent brand pistons in the same motor.
    When you check the cylinders you can tell how much they need bored.Buy pistons then get the cylinders bored to match,dont bore first as the pistons are all sized a little diferent.
    Good luck with the ski.
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