I have a 99 mxz 700. I was just in Cooke City MT, and my sled was running to rich in the higher elevations 9000-12000, causing me to rev only 7200rpm. Has anyone put leaner jets in to help. The ski-doo dealer tells me that the DPM will do all the work. I think there are 310's in there now can I put 300's in them. What setup do you have for high altitude on your MXZ's. I also have a 136", 1.5" track.