I recently picked up this sled. Female owned, 800 hours and hadn't been registered since 03. I changed out the bearings and speedo key and put a new chain in. Thing checked out great and runs awesome. I have a clicking sound coming from what I think is the clutch side of the sled at low speeds. (with the sled running it's hard to narrow it down) It also has an abrupt catch when the clutch engages the track. Again the sled runs great, but I'm not sure what to look for to see if I can correct the clicking sound. We have 3 other sleds (ZL 440, 500, 600) and none of them make the sound.