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Discussion Starter #1
[?]I have lost my second heat valve plug this year on a 550 fan cooled. Is there a reson for this happening and how important is this plug. Is it weather specific? Under what conditions may I run without it?
 

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Discussion Starter #3
It is a rubber plug, covers a hole the size of a quarter, in the engine shroud, mid way between spark plugs and 3-4 inches back toward rear of snowmobile.
 
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