I have a 2001 yz426 with stock Ti valves, one exhaust valve clearance is at the upper limit of normal 0.25mm and the other is 0.30mm (normal range 0.20-0.25mm). By the way, the bike is running fine, I've been running this way for a couple short rides since I added a hotcams exhaust cam. Clearances haven't really changed after a couple checks. I know, shame on me for running it out of spec:bonk: , but now I have the time to get around to taking off the cams to get to the shims. Should I adjust the 0.30mm down to 0.25mm or should I adjust both to around 0.20mm? In other words is it better to shoot for valve clearances on the tight or loose side? Will the valve clearances generally get alittle tighter over time as they wear into the seat? If so, adjusting towards the upper limit of 0.25mm would probably be better-right? The other factor is that all the current shims are original factory (so I have some weird sizes not available to the public, like 184's and 188's). The one with 0.30mm valve clearance has a 184 shim, so if I go to a 190 shim my clearance should be 0.24mm, but if I go to a 195, then I'm just alittle too tight at 0.19mm. I've heard a loose valve is a happy valve, so I'm going to shoot for valve clearance on the upper end of normal and use a 190 shim unless advised otherwise. I read another recent post with a question of whether its OK to run slightly loose, but didn't answer if its better to adjust on the loose or tight end of normal. Thanks for any help.