1997 Kawasaki 1100 stx backfires through carbs last chance to help
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  1. #1
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    1997 Kawasaki 1100 stx backfires through carbs last chance to help

    3 sets of carbs, 2 computers, 6 coil packs, brand new set of reed valves, new ignitor and here we are still, I've gotten it to start and run for a maximum of 90 seconds. while its running its running absolutely terrible, backfiring out the exhaust and the carbs too until it backfires hard enough to kill it. cylinder 3 still appears to be slightly fuel starved still, its finally firing on that cylinder now that i put a set of CV carbs on it but the spark plug shows its burning lean.
    ive pressurized the fuel system with air and added an electrical fuel pump as well and nothing seems to help. compression is good across all cylinders too.
    cylinder 1 seems to get hotter than 160 degrees right before it stalls out even with running it on the hose at full flow. Ive read somewhere about the crank twisting and was wondering if this was a myth, or if not how to check it properly. if there's anything else i could try before setting this thing on fire it would be much appreciated.

  2. #2
    PWCToday.com Is My Home Away From Home WFO Speedracer's Avatar
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    Checking the crankshaft index on a triple is Childs play, put a dial indicator into the center cylinder spark plug hole, rotate it to TDC, then take a pair of calipers and run it down through the front spark plug hole till it touches the piston, try to keep it centered in the plug hole, record the measurement, repeat for the rear cylinder record the measurement , if they are not the same the crankshaft is twisted.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

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  3. #3
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    Is there a tolerance on that measurement? You probably can be off a little based on how strait the caliper is in the hole and any carbon on the top of top of the piston.

  4. #4
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    .080 which equates to 2 degrees is the max allowable tolerance
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  5. #5
    PWCToday Regular guy48065's Avatar
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    All 3 pistons move up & down in unison on this motor?
    96 & 97 1100Zxi

  6. #6
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    yes 120 degrees apart as are all three cylinder engines
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  7. #7
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    The crank measurements were good. But I think I found the issue. Here is the key on the stator to crank. Not centered or in the slot. Any tips on pulling the stator or do you need a special puller?
    stator key.jpg

  8. #8
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    man that looks like death warmed over
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

  9. #9
    PWCToday Regular guy48065's Avatar
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    Quote Originally Posted by WFO Speedracer View Post
    yes 120 degrees apart as are all three cylinder engines
    Ok I thought you were saying all 3 Pistons should reach TDC simultaneously.

    The (relative) headspace measurement is an indirect measurement of crank timing.
    96 & 97 1100Zxi

  10. #10
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    Re: 1997 Kawasaki 1100 stx backfires through carbs last chance to help

    since they are at 120 degree intervals the front and back pistons will be at the same height when the center cylinder is at TDC but they will be on different strokes on is coming up to TDC the other one is going down to BDC.
    Y'all know me, still the same O.G. but I been low-key
    hated on by most these &^$$@s with no cheese, no deals and no G's, no wheels and no keys, no boats, no snowmobiles, and no skis, mad at me cause I can finally afford to provide my family with groceries

    WWSRD , What would Speed Racer do ?

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