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RZR 800 gas& spark no start

Discussion in 'RZR Nation' started by RodReinke, Sep 8, 2020.

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  1. RodReinke

    RodReinke Rod SXS Nation Rookie

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    RZR 800s

    Hi guys we own a 09 rzr800 this weekend it ran for a few seconds and quit it has good blue spark and we pulled the injectors and their spraying good.we even tried starting fluid , not so much as a spudder, is it possible it sheared the flywheel keyway? a it does have compression
     
  2. Pede

    Pede SXS Nation Expert

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    09 700 Ranger

    Any codes? could be a crank position sensor or ECU, not at lest popping has me scratching my head.
     
  3. Seastacker

    Seastacker Carl Moderator

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    2019 Polaris General 4

    On top of what Pede said:

    Not sure on the 800's, but a loose valve adjustment MAY cause this, or at least contribute and is worth a quick check. I would also check fuel pressure which should be somewhere in the 39-41 range (typically). There are cost effective EFI test gauges available online as well as at Harbor Freight. Compression check done?

    PS....I'm sure its happened in a SXS, but I have not heard of a key shearing and causing this. Its one of the first places I go in old outboards and small engines, I just cant recall that ever being the issue on a SXS.

    Keep us posted.
     
  4. Quaddin4real

    Quaddin4real Jason SXS Nation Regular

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    2005 Polaris Ranger 700 xp efi

    I had this exact same problem on a 700 Ranger, it was the crankshaft position sensor. I had spark, removed the injectors and was spraying great. So I figured it was electrical and traced it down to the crankshaft position sensor. When I removed it, it was rusted and look terrible. I didn't consider my ecm/ecu as it was new.
     
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