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  1. #1

    Join Date
    Aug 2014
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    Otsego, MN
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    93 SL 750 with 94+ crankcase

    I want to say thank you to the greenhulk for providing all the information we need to keep the 1993 SL 750 my brother and I have had since 1998 running. We like how the SL hulls ride, so we've done our part to keep it running by taking care of it following the advice here.

    We recently purchased a used 93 (our 2nd ski), and we are in the process of getting it running. It appears to have suffered a lean burndown taking out pto cylinder with the center showing some signs of detonation and the front looking very lean (all black, no wash). Since the fuel system / pump hasn't been upgraded and we found a plugged filter, we think we have a root cause for the burn down though we still plan to do all the other needed checks / upgrades. Since purchase, we have also figured out that it has a 94+ crankcase (no lower cooling connections), so there must have been a rebuild / swap at some point in the past. We already found a used cylinder and piston from a 94+ to replace the bad PTO, the front and center cylinders are 115+ psi yet. Upon receiving the 94+ cylinder, we noticed the old cylinder from the PTO let water into the crankcase (assume it's a 93) versus the 94+ cylinder has water passages to crankcase blocked off internally.

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    So, my main question, are there any issues with using 93 cylinders on a 94+ crankcase besides having no way to drain the water from the crankcase for winterization? We have yet to check the other two cylinders, but knowing it was run with a 93 already, we'd like to understand what else we need to lookout for. I assume it's possible the rear crank seal could be the cause for the rear PTO failure and center detonation if it did go through a winter without being drained somehow. We are planning on doing a crankcase leak down test, but haven't done it yet.

    Next question, if we have other cylinders from a 93, what should we do?


  2. #2

    Join Date
    Aug 2014
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    Otsego, MN
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    27
    Remove the starter and fuel runs out... What a mess... Time to part out?

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  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by jlee_58540 View Post
    Remove the starter and fuel runs out... What a mess...

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    With any older watercraft, until you take things apart and thoroughly inspect you never know what you will find!

    Flywheel housing full of gasoline is unusual

  4. #4

    Join Date
    Aug 2014
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    Otsego, MN
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    27
    Gaskets? Who needs gaskets..

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    Any the source for the fuel in the flywheel housing?

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    Crank index off by 2mm, sending it off to get to get checked out. Who knew how much fun this old guy was going to be?

  5. #5
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    At that point, I think I would just do a full rebuild of the motor.

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