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  1. #1

    Unhappy 1993 Polaris sl750 Fire in the hole

    Hi I am new to this sight but very nice I have two Polaris sl750's one runs great the other on did until last year me and my brother were out goofing around and the 93 started running like crap you cant get it over half throttle at all or it starts to spit and sputter and you can see fire in the bottom of the carbs I was thining timing but I dont know how to change it if it is can anybody help I have had a couple boat mechanics say good luck cause it has stumped them even andything would help thank A Lot


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    Check compression. If that is good, check crank index.

    My guess is damaged piston(s), and/or damaged intake reeds.

  3. #3
    I did check compression the front two cylnders are at 120 to 125 and the rear is at 100 the reeds are ok I checked those already too I just keep thinking the crank might have twisted and the timing is off now but I have no clue as to go about checking it thanks for your help

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    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by s102882 View Post
    ...thinking the crank might have twisted and the timing is off now but I have no clue as to go about checking it thanks for your help
    Quote Originally Posted by xlint89 View Post
    Proper procedure is to use a degree wheel and a dial indicator. Each piston should be at TDC exactly 120* apart from one another.

    Generic method (not entirely accurate)
    Bring the CEN piston to TDC. And then measure down to the tops of the other pistons through the spark plug hole. A new pencil or dowel rod works good for this. They should measure exactly the same. If they are off, your crank may be out of phase. If this is the case, do the "true" indexing method before you assume it's bad.
    If you have a dial indicator, that is more accurate for measuring the distance from plug hole to piston top.

    Here is another method.

  5. #5
    The wierd thing though with it running you can cover the number 3 cylinder carb with a rag and no change in the rpms the other 2 it wants to dye right out

  6. #6
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by s102882 View Post
    ...you can see fire in the bottom of the carbs...
    Quote Originally Posted by s102882 View Post
    The weird thing though with it running you can cover the number 3 cylinder carb with a rag and no change in the rpms the other 2 it wants to die...
    Which carbs can you see fire down below?

    To make it consistent for the rest of us, please use the following cylinder names;
    MAG = front cylinder
    CEN = center cylinder
    PTO = rear cylinder

  7. #7
    I am getting fire in the mag and cen and I am in the pto just not as consistant

  8. #8
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by s102882 View Post
    I am getting fire in the mag and cen and I am in the pto just not as consistent
    All three?

    Perhaps the flywheel has twisted on the crankshaft...

    Can you put a timing light on it?
    See page 480 in the 1992-1998 Service Manual.

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    If not the reeds, then check the crank index.

    Check the flywheel to see if the woodruff key sheared.

    Can you try another CDI to see if that helps?

    Ohm test the stator to make sure it's good.

  10. #10
    No I cannot get a timing light on it without taking the motor out thats the part thats sucks and it looks like i have to pull the gas tank to get the stator cover off so I can try that tonight. I did check the reeds and they seem to be ok they are all closed thanks for everyones help it is greatly appreciated

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