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I have a 1997 Polaris Ultar 680 triple. A week ago I ran 70 plus miles in the morning and that evening me and the wife went out. About four miles into the ride the temp light came on and the expansion tank pressurizied and blew all the coolant. Right away I thought head gaskest(s). I replaced all the head gaskets and water jacket gaskets but it still overheated when I put it back togather. The cylinders and pistons looked good and when I did a compression test all cylinders were the same.
If anyone has run into the same problem I sure could use some help.

Thank you
 

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ZR rider
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What general temperature do the heat exchangers feel like? Warm? Cold? Hot?
 
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