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  1. #1
    Mongoose's Avatar
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    Q for the old school gp 1200 guys (jme p,wash,Carl etc)

    Guys,
    I am seriously thinking about going back in time !!
    I ride in the rough, and miss the lightness of the old gp hulls.
    im getting too old for my Blaster 1, so I am selling it and my Gpr to get a 99GP.
    Iv'e got the obvious stuff(Extremeteamracing-thanks Mr Thorne and PatM!)
    What else can I do?
    CDi's are a no no-can't get them, and i sold one here last year- doh!!
    Would the 3 degree timing advance key work with this engine?
    The bypass from the pipe on the front of the head helped in the old days.
    Can I still do this, and incorporate the jet works valve, or do I need dual cooling?
    Any other bright ideas that where top secret back then, but you would share now???


  2. #2
    Old Ski Insanity w/rpm500's Avatar
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    Check out the old school YAMI section....a bunch of us post info on RAIDERS and GP's,lots to read and share...also look for the GP bible... its info is still valid!!!I've been told by SPUD that the 3 deg. key works well on the gp's (760 and 1200) . jetworks will help you on hole shot. get the flow restrictor valve too (DARTH recomended) .The extra bypass on the head .. some-do some- don't
    Last edited by w/rpm500; 02-12-2007 at 05:01 PM.

  3. #3
    cheatin' piston popper addicted's Avatar
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    Quote Originally Posted by w/rpm500 View Post
    Check out the old school YAMI section....a bunch of us post info on RAIDERS and GP's,lots to read and share...also look for the GP bible... its info is still valid!!!I've been told by SPUD that the 3 deg. key works well on the gp's (760 and 1200) . jetworks will help you on hole shot. get the flow restrictor valve too (DARTH recomended) .The extra bypass on the head .. some-do some- don't
    Where does one look for this?

  4. #4
    Old Ski Insanity w/rpm500's Avatar
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    I'M SURE YOU HAVE SEEN THIS... WE CALL IT THE GP BIBLE!!!http://www.extremeteamracing.com/97-99GP1200.htm
    GROUP K HAS GOOD INFO, STILL LISTED ON SITE... MAINLY IN THEIR UPGRADE SECTION!!!
    Last edited by w/rpm500; 02-12-2007 at 05:48 PM.

  5. #5
    cheatin' piston popper addicted's Avatar
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    D'oh I had a feeling that's what you were talking about, but had to make sure. Thanks!!

  6. #6
    ....back from the dead.... J-ME's Avatar
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    I would stay away from a 3 degree key if you are running 150 or more of cranking compression.

    The OEM CDI offers no upper RPM retard. I feel as though the factory curve is pretty agressive.

    Welcome back!

    Feel free to PM me if you have any questions or thoughts......or better yet post 'em up, because others may have the same questions.

  7. #7
    Mongoose's Avatar
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    I feel such a twat!
    I did not even notice the old school section ! Sorry!!!
    J-me, I was thinking of just knocking about 30 thou off the oem head, and use the 3 degree key. Is this too much???

  8. #8
    Flying Scotsman's Avatar
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    It won't live long with more timing and raised compresion.

    Do you want to run pump gas.
    How much do you want to spend.
    How fast to you want to go.
    What are the riding conditions.

    Many questions but I would stay away from a key.
    SCOTT.........

  9. #9
    ....back from the dead.... J-ME's Avatar
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    It is not only about dome volume, but the thickness of the squish band also.

    What octane gasolines do you have over there?

  10. #10
    Mongoose's Avatar
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    Wev,e started getting good octane over here now, so not a problem.
    95, and 97 octane. I know the octane is measured differently, but our normal ratted stuff is 87 octane, which I assume is the same as your 'normal' fuel grade.

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