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  1. #1
    ThrottleOut's Avatar
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    94 SLT 750 Oil Pump / Oiling Question - Converting to variable ratio pump

    When I bought my 94 SLT 750 I also got it with a 95 SLT 750 that ended up being a parts ski and was used to get the 94 up and running. The carbs on the 94 were so badly rusted inside that the 95 carbs were rebuilt and used and the 94 carbs were scrapped. On the 94 the previous owner had deleted the oil injection and I haven't put it back in but would like to so I don't have to premix and to use less oil, burn cleaner, reduce chances of loading up, etc.

    I could just reinstall the fixed ratio oil pump on my SLT and go that route but I also have the linkage, variable ratio oil pump, tank, sending unit, etc so I could add in either the fixed ratio oil pump or the variable ratio pump. I was thinking I'd like to add the VRO pump since it's really no more work than just the regular one.

    When I had both skis, I noticed that the oil injection on the 95 was injected above the carbs and was in the airbox and on the 94 the oil injection is in the intake track below the carbs leading up to the reeds. I suspect having it higher in the intake tract would be better for atomization of the oil/fuel but I would think it would be fine in the lower one with the VRO pump. Anyone have any thoughts on this? Would I be ok to just add the pump or would I be better off to cap the lower ports and look for the 95 style lower air cleaner assembly?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Unlike fuel which needs to be well mixed into the air stream, the oil just needs to get into the crankcase. Think of it as an oil dribble rather than a spray. When it passes through the vibrating intake reeds the oil will get distributed well enough.

    Either oil feed position is fine, use the one that makes the most sense for your situation.

  3. #3
    LaveyT's Avatar
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    I agree with K, I have both types and no issues with either type.

  4. #4
    ThrottleOut's Avatar
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    That was my assumption. I figured I was over-thinking it. The more I thought about it the more I figured it would be just fine. It just seemed interesting to me that Polaris made the change from one location to the other at the same time as the oil pump revision.

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by ThrottleOut View Post
    ... It just seemed interesting to me that Polaris made the change from one location to the other at the same time as the oil pump revision.
    Polaris only started making watercraft for 1992. The first few model years saw lots of revisions and improvements as they got feedback and experience from the units in the field, and the manufacturing process got tuned.

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