I've been watching and posting for 3 weeks and havn't see anyone discuss intake and exhaust valve clearance checking or adjustment. I know the WR426 utilizes "shim in a bucket" technology that I have no experience with. I now have 260 miles on the machine and it needs to be checked. I am mechanical and not affraid to tackle that project if I had a little more tech advice and experiences from others to draw on. The manual discusses the subject but it's rather vague. Are there any good links that adresses this subjects more thoroughly? I'll hang up and listen !!