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Thread: burnt piston

  1. #1

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    burnt piston

    In need of help.

    I have 1995 Polaris SL 650. I have had it for 4 years and it has run great until last year. I had to have the carbs rebuilt when I got, and other than old natured it has run great. Last season it burned a hole in the center of the 1st piston (1st from the rear of boat forward).
    My question is "Do i have a carb issue or an oil issue. Or both" My plan was to replace the piston. Convert to pre-mix, and clean the carbs. Or should I have the carbs rebuilt?

    Any help would be great

    Thanks
    Mark


  2. #2
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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    Welcome to The Hulk!

    Hole in a piston means it ran lean. Nothing to do with oil. Did you upgrade the fuel pump and remove the auto cock? IF so, I would go thru the carbs again.

    There are alot of great resources about these topics that can be found here: http://polarispwcknowledge.shorturl.com/

  3. #3
    john zigler's Avatar
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    rebuild carbs. be sure to use only genuine mikuni parts.

    replace ALL fuel lines, do the triple fuel pump upgrade, and replace the fuel select switch.

  4. #4

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    Do not forget to upgrade the fuel pickup lines inside the gas tank.

  5. #5
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    Quote Originally Posted by Blackwoodz View Post
    Do not forget to upgrade the fuel pickup lines inside the gas tank.

    ...
    Please do not post links to Polaris manuals. It is copyrighted material and you/we/us could be sued by Polaris for doing so. Can we sticky this somewhere to inform all members not to be doing this????
    Last edited by K447; 06-10-2012 at 12:50 PM. Reason: Link removed

  6. #6

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    Quote Originally Posted by BryanP View Post
    Please do not post links to Polaris manuals. It is copyrighted material and you/we/us could be sued by Polaris for doing so. Can we sticky this somewhere to inform all members not to be doing this????
    I had no idea. I assumed that since Polaris was no longer building skis these were public domain. I apologize.
    Can Mods delete these post?

  7. #7
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    Quote Originally Posted by Blackwoodz View Post
    I had no idea. I assumed that since Polaris was no longer building skis these were public domain. I apologize.
    Can Mods delete these post?
    You can edit your own post

  8. #8

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    I did not up grade anything. The guy I got it from was a mechanic and he rebuilt the carbs.
    She was my 1st ski and the most fun to ride so I really want to get her up and running.
    Thanks for the links and suggestions.

  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by emtmark68 View Post
    In need of help.

    I have 1995 Polaris SL 650. I have had it for 4 years and it has run great until last year. I had to have the carbs rebuilt when I got, and other than cold natured it has run great. Last season it burned a hole in the center of the 1st piston (1st from the rear of boat forward).

    My question is "Do i have a carb issue or an oil issue. Or both" My plan was to replace the piston. Convert to pre-mix, and clean the carbs. Or should I have the carbs rebuilt?

    Any help would be great

    Thanks
    Mark
    Cylinders are always numbered from the Front of the boat

  10. #10
    bowsniper's Avatar
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    Magneto- front piston- its called the "Mag" for short. Its the front or no.1 piston. It is called the Mag because the Magneto cover is in the front of the motor.

    Center is just that, the center. Its referred to as the "Cen" when abbreviated.

    Power take-off- Rear piston- its called the "Pto" for short. Its called that because its where the crank is protruding out the back of the engine and transmits power to the impellor.. Power takeoff can be something like a powered shaft that protudes out of a farm tractor to hook up other accessories like a spiral grain lift.

    Hey Keith! Welcome back.

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