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  1. #1
    TyCast's Avatar
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    Post Polaris SL 650 - I think Im gonna go full Pre-Mix

    Hello all.

    Its been a long time. I just recently fixed up my jet ski earlier this Spring. However, just a few weeks ago, I ran into a new problem. The issue was all three of my cylinders fouled out from too much oil.

    Im convinced that I should just locate the oil pump, cap it and convert the Polaris to Pre-Mix fuel.

    I watched this YT video to find the location of the oil pump:



    Im hoping all I need to do is remove the air intake and I should be able to reach the oil pump? Anyone else do this conversion? Any tips you want to offer?

    Thanks,
    TyC

  2. #2
    Click avatar for tech links/info K447's Avatar
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    What year is your SL650?

    Why do you want to run the engine using oil pre-mixed into the fuel?

    1992 and 1993 Fuji engines have a bunch of additional cooling hoses down low around the engine, which might impede access to the oil pump. After 1993 the crankcase did not have water cooling.

    If you have not already, bookmark this link. There is a lot of useful info.
    Including a link to the online Polaris parts diagrams, which show you where things are, part numbers, etc
    Last edited by K447; 09-19-2021 at 09:02 AM.

  3. #3
    BlueFishCrisis's Avatar
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    Quote Originally Posted by K447 View Post
    What year is your SL650?



    1992 and 1992 Fuji engines.....
    Haha both years.


  4. #4
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    I find it interesting that you oil fouled your plugs. I have never really read about that happening.

    I believe the first model years used a constant rate pump. On the newer years, they went with a variable rate oil pump. Meaning it could vary the amount of oil injected by throttle position. Maybe it's because the problem you are experiencing that is why they went variable?

    Before you get into it, let's see what is happening first.

    What oil are you using? Is it TCW3 rated oil?

    What spark plugs are you using? Are they properly gapped?

    Are you getting a strong blue spark when testing? Might need to cut the plug wires back 1/4" to get strong spark.

    Do you do a lot of no wake zone riding? This would be the biggest reason you are fouling out plugs.

    Are your carbs adjusted properly? Idle mixture screw may be off and adding to the problem.

  5. #5
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by BlueFishCrisis View Post
    Haha both years.
    You caught me!
    I made an error.


    Fixed it.

  6. #6
    TyCast's Avatar
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    My ski is a 1993. When I was riding it, I was doing some low-speed riding around. I use Quicksilver brand 2-stroke Oil. I use NGK BPRES Plugs. I havent tested the plugs but I am using a smaller than typically battery used inside, maybe the spark isnt strong enough....

    I havent messed around with the carb, I bought it used online and have not adjusted it yet. Ive been meaning to find that idle screw as my throttle cable feels a bit loose.

    Is there any big disadvantages to using premix fuel? What about getting a new oil pump?

    The reason why I wanna go premix is (1) So I dont have to worry about the oil pump and (2) Because it might improve overall performance.
    Last edited by TyCast; 09-19-2021 at 12:42 PM. Reason: added a statement.

  7. #7
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Quote Originally Posted by TyCast View Post
    My ski is a 1993. When I was riding it, I was doing some low-speed riding around. I use Quicksilver brand 2-stroke Oil. I use NGK BPRES Plugs. I havent tested the plugs but I am using a smaller than typically battery used inside, maybe the spark isnt strong enough....

    I havent messed around with the carb, I bought it used online and have not adjusted it yet. Ive been meaning to find that idle screw as my throttle cable feels a bit loose.

    Is there any big disadvantages to using premix fuel? What about getting a new oil pump?

    The reason why I wanna go premix is (1) So I dont have to worry about the oil pump and (2) Because it might improve overall performance.
    Is the quicksilver oil TCW3 rated?

    NGK BPR What number spark plug?

    What are they gapped at?

    Battery shouldn't matter to the spark created. Magneto takes care of that.


    There will be no performance improvement from eliminating the oil pump. You would not have to worry about the oil pump failing and have a little more room to work on things if you remove the oil tank. You will use a little more oil by going premix and lose the convenience of putting just gas into the fuel tank. (gas dock)

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