I ride my predator at 4800 to 6000 alt. Is this 150 jet just what polaris throws in as general jetting for most of the predators or do they try to put in one that is close for the area alt. I havn't checked the plug yet, because they are kinda a pain and I'am sure the cold will make difference. I was think maybe a 155.

 

Check the owners manual. Every Polaris I have owned had the jetting chart in there. The dealer is supposed to set it up for the area you ride. Personally I have never seen one that does.