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  1. #1

    1995 polaris 750 slt goes into limp mode

    i have this polaris 750 slt number cylinder gernaded so replaced pistion and cylinder found out cylinder fuel adjustment screw had backed out. took it to the lake and engine light would flash it was hard to start. when running would not go above 3900 rpm at first. worked ok for less than a minute than died and light came back on and it went into limp mode.


  2. #2
    Are you still running with the original oil pump injection or is it set up for premix? If you still are using the oil pump, check to see if there is oil in the oil tank. If you converted to premix, the float sensor for the oil tank needs to be modified so that the brain don't think that the tank is empty.

  3. #3
    johnsonmtz's Avatar
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    The 1995 SLT750 did not have a limp mode. The light would come on for low oil, low fuel, and an overheat condition. None of these warnings will limit RPM.

    Did you do a complete run through on the Fuel system?
    3-outlet fuel pump
    Remove autocock
    check fuel selector
    Fuel lines in good condition/replaced
    Pickups in tank clean

    Are there any words flashing on the MFD like HOT, OIL, FUEL, or LOPR?


    Sorry there are more questions than answers right now, but knowing all this will help solve the problem.
    KJ

  4. #4
    removed autococker still using orignal fuel pump using oil pump has oil not flashed on screen just engine light blew the number one piston again

  5. #5
    johnsonmtz's Avatar
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    Quote Originally Posted by natehodge View Post
    removed autococker still using orignal fuel pump using oil pump has oil not flashed on screen just engine light blew the number one piston again
    Okay Nate. That means you definitely have a fuel restriction and/or delivery problem. You definitely need to solve this problem or you'll just keep roasting pistons. Also, as a word of advice, if a ski is running that poorly it's not a good idea to keep running it. These problems don't just 'clear out', the ski either runs properly or something is wrong. It's best to find what's wrong and fix it rather than wait for something more expensive to happen.

    Here is the sequence of maintenance and updates that are essential:

    1) Order complete genuine Mikuni rebuild kits and completely run through the carbs. John Zigler at Rock County Jet is a great source for this, his kit includes only the parts needed for the Polaris version of the Mikuni SBN38 and he also includes new needles and seats.

    2) Buy a 3-outlet fuel pump, install it, and re-route the fuel lines for this update. Member unityRacing has a 3-outlet pump for sale in the Classifieds. Zigler also sells these including the brass plugs necessary for the updated fuel routing.

    3) If you've never replaced the fuel lines (all of them) now is the time to do it.

    4) Make sure the fuel restrictor is present in the return line. Without this your fuel pressure will run low and can starve one or more cylinders.

    You really need to do all of this before you put another piston in this ski.

    KJ

  6. #6
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    Quote Originally Posted by johnsonmtz View Post
    Okay Nate. That means you definitely have a fuel restriction and/or delivery problem. You definitely need to solve this problem or you'll just keep roasting pistons. Also, as a word of advice, if a ski is running that poorly it's not a good idea to keep running it. These problems don't just 'clear out', the ski either runs properly or something is wrong. It's best to find what's wrong and fix it rather than wait for something more expensive to happen.

    Here is the sequence of maintenance and updates that are essential:

    1) Order complete genuine Mikuni rebuild kits and completely run through the carbs. John Zigler at Rock County Jet is a great source for this, his kit includes only the parts needed for the Polaris version of the Mikuni SBN38 and he also includes new needles and seats.

    2) Buy a 3-outlet fuel pump, install it, and re-route the fuel lines for this update. Member unityRacing has a 3-outlet pump for sale in the Classifieds. Zigler also sells these including the brass plugs necessary for the updated fuel routing.

    3) If you've never replaced the fuel lines (all of them) now is the time to do it.

    4) Make sure the fuel restrictor is present in the return line. Without this your fuel pressure will run low and can starve one or more cylinders.

    You really need to do all of this before you put another piston in this ski.

    KJ
    Great advice!!!!!! If you don't do all of these things you will definitely kill it again.

  7. #7
    thanks for all the help it looks like its going to the shop though they wanted it done now and im tight on time so where see how that goes if all else fails i have a place to start

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