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  1. #1
    gkecorp's Avatar
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    Carb Help 2000 GP760

    I'll try to make this short:
    Bought a GP760, ran good the first day. Second run, only half power. Died, wouldn't start again. Got with oside (carb master) he said check carbs.
    I checked carbs, clean inside and out. Replaced fuel lines. Replaced fuel filter. Replaced spark plugs. Cleaned oil injection lines.It will not start. When it does with carb cleaner spray, it wont run with oem "airbox" on. It will without it. Once it is shut off, it wont start again, even with choke on, unless it gets a shot of "gas". It acts as if it is not getting fuel, and backfires while trying to start. Oside said check the screen inside the fuel pickup.I dont know about Please anyone who has some idea's, input them here. I need some help!!


  2. #2
    hawkrdr's Avatar
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    Did you rebuild the carbs or just check in carb filter?

    The screen in in the fuel tank for the pickup it could be clogged.
    Is there a inline filter/water separator on that model?
    Another question is.. and it is a silly one.. Do you have the fuel lines on right? Return vs. feed?

  3. #3
    gkecorp's Avatar
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    Quote Originally Posted by hawkrdr View Post
    Did you rebuild the carbs or just check in carb filter?

    The screen in in the fuel tank for the pickup it could be clogged.
    Is there a inline filter/water separator on that model?
    Another question is.. and it is a silly one.. Do you have the fuel lines on right? Return vs. feed?
    I opened the carbs, good there. I need to check the screen in the fuel tank next! There is a water separator, but not inline fo the fuel line, kinda like a side line off the tank.The lines are on correct and the tank and fuel valve pressurizes and works! What else am I missing?

  4. #4
    Moderator OsideBill's Avatar
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    Get a can of fuel run a line from the carb inlet into the can try starting the ski if draws fuel from the can and runs you know your issue is upsteam from the carbs, if not it is in your carbs. Remember the inlet is the fitiing closest to the base of the carb.

  5. #5
    gkecorp's Avatar
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    Quote Originally Posted by OsideBill View Post
    Get a can of fuel run a line from the carb inlet into the can try starting the ski if draws fuel from the can and runs you know your issue is upsteam from the carbs, if not it is in your carbs. Remember the inlet is the fitiing closest to the base of the carb.
    Thanks bill, I will try that. UPDATE: got my compression tester back from a family member, both cylinders are at 75psi. Guess I need to pull the head and see whats up? I am gonna try the "gas can" trick before I pull the head. I dont see why compression would be so low and exactly 75 on both. Tried 2 guages, both read 75....and new idea's?
    back cylinder has a few detonation marks front is clean....

  6. #6
    hawkrdr's Avatar
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    reeds? bad gaskets on the intake or exhaust side?
    Poor a little oil into the plug holes and try compression test again.

  7. #7
    gkecorp's Avatar
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    Quote Originally Posted by hawkrdr View Post
    reeds? bad gaskets on the intake or exhaust side?
    Poor a little oil into the plug holes and try compression test again.
    Yeah it's weird cause it ran fine, then it acted as if the carbs were dirty, died and no start since. It will run with "a shot of gas" and stay running, but once you put the breather on it stalls, or once you shut it , it wont start back up without the shot of gas. I will do more tonight and let you know. You can always head over to my house and "help" me get these two ski's running..LOL

  8. #8
    hawkrdr's Avatar
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    Did you find anything out on the 760 yet?
    Is the compression bad on the 760 or one of your 1200's?

  9. #9
    Try running the reserve line straight to the fuel filter

  10. #10
    gkecorp's Avatar
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    Thumbs down update

    Ok, I have 75psi on both cylinders. Weird that both are low and exactly the same. I am going to re-test with another guage!

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