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  1. #1
    750sl's Avatar
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    Unable to start 95 750sl

    Im having trouble starting my 95. Last weekend I had cleaned out the waterbox because it looked like it had ˝ inch of black oil in it. Afterwards I was unable to start ski. Checked compression and spark= good. Crankshaft spins freely, with no grinding. Pulled heads and there was a thick brown oil coating on pistons. Plugs had it to when I pulled them earlier. While attempting to start I noticed flame down carbs. Pulled pulse line and fluid came out while cranking. Not much but it was there. Cycled until it was gone. Tried to start it again no go. Pulled pulse line and fluid came out again. So this time I removed the exhaust manifold, pipe and starter to get to the three drain bolts underneath them. I also removed carbs, intake manifold and reed cages. Nothing drained from drain holes. I cleaned out crank, jug passages with brake parts cleaner. Cleaner fluid came out of drain holes, clear. Also cleaned pipe and exhaust manifold. Put everything back. I also switched to another known good set of carbs. Tried again, same results. No start. Brownish oil coating top of pistons again. What else should I be looking at? Thanks.


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Brown oil? Milky light brown milkshake or rusty red brown?

    Brake cleaner through the engine? Have you sprayed some engine fogging oil in there to protect the 'cleaned' steel surfaces from rusting?

    Flames down the carbs? Something is wrong. Is it possible the flywheel key has sheared and the ignition timing is way off? There should never be flame in the crank case. If all cylinders have good compression then timing must be wrong in order to have flame in the crank case.

    Also check crank index.

  3. #3
    750sl's Avatar
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    Light brown oil. Ill check flywheel key. Also forgot to mention it backfired a couple of times which is a first. I checked reeds they are fine. Thanks


    Also I turn motor on monthly. Add fogging oil afterwards. Just used brake cleaner to clean that one time
    Last edited by 750sl; 05-28-2011 at 03:17 PM. Reason: Added info

  4. #4
    bowsniper's Avatar
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    whens the last time it ran? getting any spark at plugs while cranking? bright blue sparks?

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by K447 View Post
    Brown oil? Milky light brown milkshake or rusty red brown?

    Brake cleaner through the engine? Have you sprayed some engine fogging oil in there to protect the 'cleaned' steel surfaces from rusting?

    Flames down the carbs? Something is wrong. Is it possible the flywheel key has sheared and the ignition timing is way off? There should never be flame in the crank case. If all cylinders have good compression then timing must be wrong in order to have flame in the crank case.

    Also check crank index.
    Definately look into all his concerns. ^^^^^^

  6. #6
    750sl's Avatar
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    Quote Originally Posted by K447 View Post

    Flames down the carbs? Something is wrong. Is it possible the flywheel key has sheared and the ignition timing is way off? There should never be flame in the crank case. If all cylinders have good compression then timing must be wrong in order to have flame in the crank case.

    Also check crank index.
    You called it. The flywheel key had sheared off. I can tell the flywheel must have been just spinning around considering the markings all the way around the inside of the flywheel hub. Will perform crank index next. Thanks.

  7. #7
    750sl's Avatar
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    Quote Originally Posted by bowsniper View Post
    whens the last time it ran? getting any spark at plugs while cranking? bright blue sparks?
    About a month ago. Inline spark tester indicated spark on all plugs.

  8. #8
    bowsniper's Avatar
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    Ah, I see, thanks.. I see you found your problem. or 1 of them.

  9. #9
    750sl's Avatar
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    Can anyone tell me the correct torque setting for the flywheel nut (22mm)?

  10. #10
    johnsonmtz's Avatar
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    Quote Originally Posted by 750sl View Post
    Can anyone tell me the correct torque setting for the flywheel nut (22mm)?
    As per factory manual, 65 ft lbs with loctite 242 on the threads.

    KJ

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