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  1. #1

    Join Date
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    SL650 motor rebuild

    What up guys, So I just got this ski. Its a 92 Polaris SL 650 the Mag cylinder had a hole in it, but it was already taken a part. I noticed that the motor was really lose, so I decided to remove the motor. Good thing I did, there were 3 bolt that fell out that hold the motor to the motor mounts. So now I have this motor sitting on my work bench all tore down. It has old gear oil in it with a little bit of water on the top of it.So I want to change it. What kind of oil is it, how much and how would you ever change that oil with out tearing the motor apart? Kind of a crazy design. Thanks


  2. #2
    BlueFishCrisis's Avatar
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    Welcome to the hulk! The 650/750/780 series of motors are all two stroke and therefore should not have any oil in the crankcase. It is typical for a little residual to be left over during normal running, but it sounds like that has been there for a while. Need to remove all of it from the case. I have used paper towels to remove in the past, although it is a bit tedious. In additon, I am not sure if all years have them, but there are three small bolts on the exhaust side of the case near the bottom that act as drains. If you have those, they can be removed to assist in draining (since you have already pulled the motor).

    You should always be cautious about water in the crankcase as it will likely have begun to rust the bearings on the crankshaft....... This is pretty much the single most costly item to replace, and one of the most critical to get right!

    This is an xlint place to get started..... http://www.greenhulk.net/forums/showthread.php?t=148277

    Also, Use the search function at the top of the site and read read read read until you can't read no more!!!!

    Be sure to ask lots of questions, all the members are here to help.

    Good Luck!

  3. #3
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Welcome to the Hulk.

    Is there any signs of rust on the crankshaft? Even just being open is enough for rust to start from moisture in the air.


    http://www.greenhulk.net/forums/showthread.php?t=82682

  4. #4

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    No it looks good, been sitting in oil. And theres not much moisture here in Las Veges, dry as hell. I just cleaned it out really good with some diesel.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    That's good. Is there any "gritty" feeling or excessive slop in any of the bearings when you spin them?

    Next check would be a phase check. (making sure the pistons are exactly 120* apart +/- 1-2*)

  6. #6

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    No it feels good no slop, feels tight, spins really good. How do I check that they are 120* apart???

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    It's covered in the 6th topic of post #5

    http://www.greenhulk.net/forums/showthread.php?t=148277

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