Thread: Unable to start 95 750sl
05-26-2011, 09:55 PM #1
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.
05-26-2011, 10:04 PM #2
- Join Date
- Jul 2007
- near Toronto, Canada
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.
05-26-2011, 10:09 PM #3
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
05-27-2011, 04:18 PM #4
whens the last time it ran? getting any spark at plugs while cranking? bright blue sparks?
05-27-2011, 05:24 PM #5
- Join Date
- Oct 2006
- Cleveland OH
05-28-2011, 03:12 PM #6
05-28-2011, 03:13 PM #7
05-28-2011, 04:03 PM #8
Ah, I see, thanks.. I see you found your problem. or 1 of them.
06-01-2011, 01:26 AM #9
Can anyone tell me the correct torque setting for the flywheel nut (22mm)?
06-01-2011, 08:55 AM #10
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