Well, I did a seach, and their really isn't much info out there for TTRs, infact, I only found one member that did it, and he didn't really post any in-depth results. I just bought the wife a TTR 125L last year. It is a great little bike, and she has had a lot of fun on it. I have already done the airbox mod, played with the Jetting, and made my own exhaust tip for it. I assume the bike came with fairly retarded timing from the factory to comply with BS emissions standards. I want to know if anyone has advanced the timing in the little bikes, and if so, was it a noticable improvement? If you did advance your timing, how much did you advance it, and how did you do it? Thanks for the input...always in search of the extra power!