Yesterday, I attempted to install a new timing chain and a 03 450 exhaust cam on my 01 YZ426. Just before I took the cam cap bolts off, I figured I'd just check my torque wrench to verify that it's working properly. I put a spare bolt in a vice and set the wrench to 30 in-lb, turned, turned some more (shouldn't this be releasing by now?) and SNAP I broke the bolt. Maybe the torque was set so low I didn't hear/feel it release? I figured that since my cover was already off, I could at least check the valves. I pull out my feeler gauges and realize I don't have the ones I need! I need smaller gauges to measure intake valves. The good news is that my exhaust valves are still in spec: .205 mm, which is near the minimum allowed clearance, but still in spec! According to the previous owner, the valves have never been inspected or adjusted. Once I figure out this torque wrench, I'll be doing the cam swap and from what I hear I'll have to adjust the valves anyway so I'll try to put them in the middle of the range.