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  1. #1

    1996 polaris sltx tuning frustrations

    I have just finished doing a whole new top end rebuild on a ski that had sat out in the elements for years. It blew out the center piston. Surprisingly the crank was totally free flowing. If it wasn't I was just going to sell the parts and make some extra money.
    OK well after getting it all back together, I did the necessary break in. Pulled the plugs to see how they looked. They looked pretty good. They were a gunmetal grey color. It ran great. Then I did the test for full throttle. Put new plugs in and went wide open to test high end richness. I could only hold it at full throttle for about 10 seconds and it started to sputter and lose power. So I killed it at full throttle immediately and checked the plugs. They were consistently white (lean). The jugs were a little warm but not steaming or burning your hand off.
    I have factory main jets in it now. Mag 138, center 142, pto 138.
    I guess I just need help trying to figure out what I should do to fix my full throttle lean condition.

    Thanks!


  2. #2
    If it sat for awhile ....you may wanna clean the carbs or rebuild them

  3. #3
    I went through the carbs and all of the diaphragms were good. Needles and mains had no obstructions. No build ups of any kind. They were awesome. I am now running premix. I did a leak test before I put the motor back in and I lost only a quarter pound over 10 minutes.

  4. #4
    casey67's Avatar
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    Brand new plugs will need 10-15 hours of running before they show "color".

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    Do you need form-a-gasket on reed gaskets when installing?

  6. #6
    BlueFishCrisis's Avatar
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    Quote Originally Posted by casey67 View Post
    Brand new plugs will need 10-15 hours of running before they show "color".
    Are you saying I can't read my plugs after a change in jetting or adjusters until I have put another 10-15 hours on them???

  7. #7
    RLACEMAN's Avatar
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    I would use the first set of plugs for testing, you need a good 1/2 hour of riding to get an accurate color reading. I can see a difference in color after an adjustment in that time. I would also double check your compression, running at full throttle & then losing power can be an engine starting to sieze.

  8. #8
    Polarisitis loonatik's Avatar
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    Quote Originally Posted by 1996sltx1050 View Post
    ... I could only hold it at full throttle for about 10 seconds and it started to sputter and lose power...
    Fuel selector valve is not at 'ON' position?
    Faulty fuel selector valve?
    Sounds like fuel 'IN' path is clogged up somewhere. Check it starting from the tank.

  9. #9

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    Faulty fuel selector valve?

    yeah check this

  10. #10

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    Gunmetal grey color is the kiss of death..
    That means you are on borrowed time.. You can burn down another piston in less than 4-5 minutes if the engine is too lean, too much timing, water temp too hot, etc..

    A tachometer, new sparkplugs & a piston wash light to visually inspect the piston tops & burn is a good start..

    I recommend "used" spark plugs for tuning (if they are good), as they will change color and show a jetting change within 2-3 minutes.

    regards,
    Randy

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