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  1. #1

    97 slt 750 runs rich, boggs

    I have a 97 SLT 750 that is giving me poor performance after sitting 2 weeks. I changed the plugs and it ran great for 100 yards and then started bogging again. I drained the fuel, still same problem. If I shut the fuel off and burn it all out, it will run well upon restart for a brief period and bog. If I prime the engine while riding, I get no improvement.

    It's running rich in the front cylinder. The two rear plugs are walnut color, but dry. I took it apart and the needle works freely. The diaphram seems to have stretched out a bit on the front cyl and won't reassemble easily. Could this be the problem? Any advise?


  2. #2
    Moderator beerdart's Avatar
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    Check the needle and seat pop-off and look for leaks around the seat o-ring.

  3. #3
    Quote Originally Posted by beerdart View Post
    Check the needle and seat pop-off and look for leaks around the seat o-ring.
    Double checked it....... I replaced the assy last year....

    it looked good to me.... anything else I should be looking for?
    Last edited by brianstrange; 07-07-2008 at 10:22 AM. Reason: more info

  4. #4
    Moderator beerdart's Avatar
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    What was your pop-off pressure?

  5. #5
    Quote Originally Posted by beerdart View Post
    What was your pop-off pressure?
    Beyond me..... I'm in a little cabin, deep in the woods with too few tools.

  6. #6
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Are you getting alot of pressure built up inside the fuel tank? Too much and fuel can seep past the needles.

    Maybe the pressure release valve is plugged?

    Have you tried cutting the spark plug wires back 1/4" or so to expose clean wire?

  7. #7
    Quote Originally Posted by xlint89 View Post
    Are you getting alot of pressure built up inside the fuel tank? Too much and fuel can seep past the needles.

    Maybe the pressure release valve is plugged?

    Have you tried cutting the spark plug wires back 1/4" or so to expose clean wire?

    I am getting pressure build up. When I open the gas cap, I get a decent hiss. The only thing to that theory is that I siphoned the gas and put in fresh gas, and it still ran the same... Would that pressure return quickly?

    also, I blew into the fuel in on the carb assy while blocking the fuel return port and im building up good pressure.

    I blew into the fuel return into the tank and I'm getting some resistance. Will that resistance cause it to run rich in front cyl???
    Last edited by brianstrange; 07-10-2008 at 11:28 AM.

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