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  1. #1
    FLjoyrider's Avatar
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    Jul 2007

    900 burnt piston lean condition??

    900 kawi has burnt piston on stator side, see pic. Wash looks a tad on the lean side but is it lean enough to cause this?! I will check reed valves, carb is super clean and all diaphrams are good. Anyone know the proper popoff pressure? owner wants to only replace the one piston which I frown upon since its going to have to be bored.. but what can you do, its his ski.
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  2. #2
    I will look it up in my manual.... I have the 1100. Also the front cylinders are know to run hotter on the 900/1100's. Any chance he has a partially blocked cooling line? or ran bad/last years gas???

  3. #3
    The pop off pressure should be 24-25 PSI for a stock setup


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