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  1. #1

    93 SL 650 bogging down at WOT

    I have a 93 SL 650 that I can not figure out. My dealer has replaced all fuel lines, filter, new carb kit, new reeds, plugs, and triple fuel pump. It runs good until you go wide open across the lake and it will die unless you let off the trottle. The only other thing I can think of is bypassing the fuel switch or changing the size of the main jets. I have no idea what size he put in but I am sure he went with the stock size. Any other ideas?

    Thanks,

    Steve


  2. #2
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    FIRST: Do not keep riding it like that. You WILL damage the piston/pistons due to lack of fuel if that is the case.

    #1 Is the autocock removed? (per Polaris bulletinn)

    #2 Replace the fuel shut off valve (petcock) $15

    #3 Were any performance parts added?

    #4 Was the rubber snorkel on the stock flame arrestor cut back to open the intake up? (per Polaris bulletin)

    #5 What are the high speed needles set at? MAG, CEN, PTO should all be different. (count the amount of turns and partial turns IN to a lightly seated position and recod them) DO NOT overtighten the needle or damage may result.

  3. #3

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    Sounds like she is running too lean. After recording the needle settings, try opening each one a 1/4 turn and try it on the lake again.

  4. #4
    Quote Originally Posted by billybaru13 View Post
    Sounds like she is running too lean. After recording the needle settings, try opening each one a 1/4 turn and try it on the lake again.
    But aren't the main jets for WOT?

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    There are hi and low speed needles

  6. #6
    Quote Originally Posted by xlint89 View Post
    There are hi and low speed needles
    So there are no main jets on my 93 SL650 ?
    Are the hi and low speed needles adjustable with a screwdriver?
    Where are the high speed needles at ?

    Thanks,
    You guys are very helpful

  7. #7
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    there are main jets and high speed needles. The high speed needles control fuel mixture from 3/4 to full throttle.

  8. #8
    My dealer replaced all lines and filters, new carb kit, put on triple fuel pump, removed petcock,replaced fuel switch, new plugs, new reeds. It runs great until you open it up across the lake and the bowls run out of fuel. Or at least that is what I think is happening. Which screws are the high speed needle adjusters the round ones to the top right (back of the ski)or the round ones with a shaft through them on the bottom left (front of ski) I live in Minnesota so I am running out of time to lake test it!!! The machine is stock and has 115 comp. in all cylinders.

  9. #9
    I need to find a new exhaust gasket for my SL650. Any suggestions.
    I saw a list here someplace but know I cant find it.

  10. #10
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Post #7 is the Mikuni carb manual.

    http://www.greenhulk.net/forums/showthread.php?t=15433

    Please read it through. It will help you with alot of your Q's.

    There are no float bowls on these carbs. All fuel gets re-circulated back to the fuel tank.

    1993 650 should have a built in restrictor. By chance, were the carbs replaced with a another set? There's a chance you may need a restrictor installed into the return fuel hose. (that's what creates fuel pressure)

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