See the previous post for background. I have an '06 WR250F. I measured my valves and they are tight. The intakes are right at .10, range .10-.15. I believe the exhaust valves are at .15 when they should be between .17-.22. The .20 would not even go in, and I have no gauge between .15 and .20. I bought the bike with 35 easy hours on it. That was the last valve check. The bike now has 120, A-level off-road, hours on it. It runs great, no noises, hiccups or problems. My question is, should I; a. adjust the valves and keep riding b. adjust the valves, replace timing chain, keep riding c. rebuild top end, stock d. install big-bore kit, Kibblewhite valves, etc. I want reliability and no increase in maintenance, as seen above. Of course, money is tight for everyone and I do not want to spend more than what is necessary. I do not enjoy digging that deep into the motor, but if I must, I want to make it worth the while. Capisce?