Well, I've got 5 years or riding, including three of racing, 2 LAB2V trips and numerous big bear rides on the wr. I do check the valves from time to time and they haven't moved in 4 years. I'm good about oil changes and filters. Its been stone cold reliable but is definitely down on power from when it was new. When its cold, I feel damn near no compression on the kick start lever. So its time for a top end. Actually, the f#$%kin spark plug is stuck in the head and I can't get it out So the head is coming off. I've ordered a piston, rings, gaskets and a timing chain. Is there anything else I should be prepared to replace. I will inspect the valves once I get the head off, so I won't buy them up front. But, they have never moved and the bike still hauls my fat ass around quite easily. Is there anything else I should get upfront that I know for a fact should be changed on a bike with this much use?