Go back out to the home page, click on technical pages, then snowmobile tech, then CLUTCHES and Jetting. Scroll down to Clutching Tuning & Jetting Page. While you are in tech pages, read, read, read. There are two setups listed for your sled. One for trail riding is very simply to swap out your helix and secondary spring. You can purchase them from your Yamaha dealer. The helix is p/n 8FA-17604-00-00 and costs about $100 depending on where you buy. The green spring is p/n 90508-556A2-00, about $20. You could also look for used.