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  1. #1

    I need help with a SL650

    I have a 93 SL650 thats given me problems.
    The motor had been rebuilt when I recieved the ski. I had it on the water for around 45 minutes and it lost power. Got it home and pulled the plugs, and found a hole in the 3rd cylinder (far rear). I snapped a couple of pictures, and would like if you could point me in the right direction.

    Picture 1 is of the burn piston in cylinder 3 (rear cylinder)
    Picture 2 is of the piston in cylinder 2 (center cylinder)

    I've ordered a 3 output fuel pump, and I've pulled the carbs, and am planning on rebuilding them. Does this look like a lean codition? The head on the rear cylinder looks fine, nothing wrong with it. The electrode on the spark plug was melted.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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Name:	Cylinder 2.JPG 
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  2. #2
    Moderator beerdart's Avatar
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    Yes lean.. Make sure the carbs and fuel system is in good shape. As it sounds like you are doing.

  3. #3
    Do both pistons look lean? I was reading some on piston wash, and It looks like I have a large clean area on the center piston.

    Would this assumption be correct?

  4. #4
    Moderator beerdart's Avatar
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    The center looks safe but after 45min is hard to generate a good wash.

  5. #5
    Thanks for the quick replies Beerdart!

    The front piston looks just like the picture of the center. Could the crank index cause this? I'm planning on checking that the best I can, and I'm also going ot do a leak down test to check everything there.

    Thanks again for the help

  6. #6
    Moderator beerdart's Avatar
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    Crank index will affect how the engine runs. When you pull the carbs look for anything that stands out on the PTO(Rear) carb. Clogged jet junk in the filter strainer etc.. You want to find the cause before you start throwing pistons at it. Also the PTO is where the pulse line for the fuel pump is check the line for cracks and wear..

  7. #7
    I'm going to change all the fuel lines in the ski.

    I've got another question for you now though. I got to looking at the ski, and the autocock is still there. I read that you should get rid of this, which I plan to do. The question I have is, what does the line that runs into the intake on cylinder 3 do? I guess really, what did the autocock do?

  8. #8
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    It prevented fuel flow when the engine was off. They were known to go bad and lean out the engine.

  9. #9
    Thanks Xlint.

    So I'd just remove it, and cap the pulse line to it, correct?

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Yes, make sure it's an air tight seal.

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