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  1. #1

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    1994 sl750 carb question

    I just finished building this motor after a lean burn down. The problem was from running lean due to adding ocean pro F/A's, and i did open the hi speed needles an additional 1/2 turn. AND the complete fuel system has been totally updated(new 780 pump, restrictor in the hose, new 1/4" hoses, filters, tank upgrade from a '95 model, real mikuni carb kits, etc)
    Question is, if i bump up to a 102.5 from a 90 main jet, with the OP's, will that help the longevity?

    ---------- Post added at 02:32 PM ---------- Previous post was at 02:30 PM ----------

    Also, i would like to keep the oil injection (wife's ski) with the 102.5's, but not sure if the extra fuel will lean out the mix ratio.


  2. #2
    thester71's Avatar
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    Are your injector fittings on the f/a base or the intake?

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    Click avatar for tech links/info, donation request K447's Avatar
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    Oil injection flow rates should be just fine regardless of the jetting required to get the engine running properly. More air into the engine (due to the flame arrestor change) doesn't really change the amount of oil the engine bearings need, or get.

    Carburetor pop-off pressures checked?

  4. #4

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    nipples are in the intake itself.
    if i recall correctly, pop off was around 18-19psi.

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    urugol's Avatar
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    Quote Originally Posted by gregr1971 View Post
    I just finished building this motor after a lean burn down. The problem was from running lean due to adding ocean pro F/A's, and i did open the hi speed needles an additional 1/2 turn.
    I recently bought a brand new set from OP, the stickers on them specify 1 full turn on the high's.

  7. #7

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    Why 105's on a 650, and 102.5's on a 750?

  8. #8

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    ok, took it out yesterday, ran ok untill the big end, has a hi speed miss, and then bogs as if it were starving for fuel???
    What should my fuel pressure be at idle? and WOT?? Pump is an octagon 780 pump, fresh build on it.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    You seemed to have replaced everything, but did you address the fuel shut off valve?

    Did you remove the autocock per polaris service bulletin?

    What's your compression on the PTO cyl? (low compression will yield low fuel pressure)

    fuel pressure at idle should be about 1-2 psi and 4-6 at WOT.

    Check to make sure your fuel tank vents are working properly.

    Do you have any in-line fuel filters that are dirty?

    Did you replace the fuel filters INSIDE the carbs?

    What are your carb screws set at right now?

    What's your pop off set at?

  10. #10

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    Fuel selector has been removed, Cleaned and greased the rubber, autocock was gone when I got the ski, comp. On all 3 is p145-c150-m150, everything in the carbs is new mikuni parts(filters, n/s, etc..), pop off WAS 16-18psi when carbs were built during the winter, never used until Sunday. no inline filters other than a late model water separator with the red ring.
    Lows are 1/2 out, highs are per Polaris manual PLUS 1/2 turn with 102.5 main jets.
    I will use the fuel cap from my dirt bike tomorrow,and just extend the vent hose up to the handlebar pad. That should eliminate any venting issues.
    Pumping the primer does not help any, I am using the #8 plugs instead of the 7's.
    It acts almost like a plug wire arcing out. Also the the hi speed bog then die.

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