I know that there is a million different threads on this. However each set up is different. When I purchased my quad I was in TN and now I reside in Colorado. My quad seized up on me since I have been here. I have since rebuilt it and now I am in need of information on jetting for my altitude. I am running a 02 400ex with stage 2 hotcams, Hotrods crank, HMF Slip on, Bored 2 over (426cc) Stage 3 CDI and Coil. I just purchased a dynojet jet kit for stage 1 & 2. If anyone has a great set-up for this altitude and my upgrades please let me know. Thank you in advance.