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  1. #1

    MSX140 thermostat housing

    Just changing the t stat on my ski and i noticed a white plastic block about 1/2 long with 4 holes in it.looking at the parts manual i don't see this white block.It sits below the spring and pop off valve.

    Was this an update? because i don't see this part in the service manual or Polaris parts breakdown,it looks simply to be adding more spring presure to the pop off valve.

    Is it required?


  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    near Toronto, Canada
    I think that 'extra' part is normal on that engine, and is intended to control the engine speed at which the valve opens.

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