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  1. #1
    rob2337's Avatar
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    94 SL 750 Ignition / Fuel Problem

    Hello all,

    I had a pretty interesting last ride of the season. My sl 650 melted both exhaust hoses. I have done a search, and will check the water filter in the exhaust. A bigger problems, is my SL 750. When riding at full throttle, it sometimes all of a sudden drops the rpms to 5000. This problem just started and is intermitent. When it bogs, I tried pulling the choke, only to have it bog more. Usually If I release the throttle, then floor it again, the revs come back up. Almost seems if I am losing a spark on a cylinder for a moment. Does the CDI have some sort of system that limits the revs to 5000 if somthing goes wrong? I pulled the plugs, all look like normal.

    Quick question about the melted exhaust: The hose melted into two, would this cause the machine to run very badly?

    Any help will be very much appreciated!!!


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by rob2337 View Post
    ...My sl 650 melted both exhaust hoses. I have done a search, and will check the water filter in the exhaust...
    Quick question about the melted exhaust: The hose melted into two, would this cause the machine to run very badly?...
    If the exhaust hose break allowed exhaust gases to flow into the under seat area, then the engine intake would be breathing those fumes in, and the engine would run poorly.

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If the exh hose melts, it gets really soft and collapses under load restricting RPM. You need a new hose and need to find why it melted down. Most likely a restriction in the cooling system, check the filter at the top of the exh pipe behind the fitting. Also look into the screen at the cooling intake in the jet pump venturi. On the 750, it sounds like you may be getting into limp mode. Is your fuel level low, iol level low, or MFD reading hot?

  4. #4
    rob2337's Avatar
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    On the 750, I am getting no MFD warnings at all. Does the 94 SL 750 even have a limp mode?

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    No it doesn't. Have you done a compression test and looked at your piston wash? Losing RPM at WOT is not good.

  6. #6
    rob2337's Avatar
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    I'll check the compression soon. I doubt that is the problem, as I think that bad compression would cause a permanent problem, not an intermittent one. It’s hard to describe, but I am flying along at full power, then an instant later it drops to 5000 rpm, then 10 seconds later it is back up to full power. Would losing a spark on one cylinder have an RPM drop like I described, or would it be much worse?

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Possibly. Check all wires for for corrosion or loose connections. Ohm test the stator and coils. If all test good, see if you can borrow a CDI to make sure that's not the problem.

  8. #8
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    have you trimed back the spark plug wires a little bit???
    i could send you a cdi put i think shipping would be nutz
    you live across the POND dont you?????????
    mattman

  9. #9
    rob2337's Avatar
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    I live in Montreal, Canada. I am going to try trimming back the plug wires a bit, I'll let you know what I find as wire conditions.

    Any other suggestions? Does anyone know if my symptoms sound like losing a spark on a cylinder?

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Intermittent problems usually are electrical. Mechanical probs would normally happen constantly.

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