hey guys! I have not been in here for a while. I am enjoying every moment on my 1999 YZ400F . I bought it with my own money and bought all the gear and modifications myself with alot of hard work . So with saying that I love this bike and want to make sure it runs well . Ive had it for a year and have had no problems.The thing is like a rock ! I am thinking about taking it apart and checking some things just because its 6 years old and have been reading things on valves and adjusting them . What would you say I should look at? Also I'm a fairly big 16 year old at 6 foot8 1/2, 215 pounds . What other mods could i do to make the bike fit me better .