At the bottom of the main 400ex page where you added this post do a search for free stuff or free mods. If you do all of those things it will help alot. Also look into a Curtis Sparks timing advance key. Its like $20 and will give you exactly what your looking for. Other than that you will need to spend some good change. Then you could go 450r carb, slip on, aftermarket air filter, rejet, cam, and the list goes on as long as your bank account does!!!
99 416ex
Big Gun, JE, Burgard, LSR, Maxxis, Tag, Hot Cam, PEP, Powermadd, DG, K&N and Maier
Thanks Burgard Racing, Colby (C&D Racing) and Pappy (BK Performance Coatings)
2009 Special Edition 450ER
Big Gun, K&N, Houser, Tag, Powermadd, Pro Armor and LSR
1995 TRX90
Big Gun, ITP, Tag, K&N and Blingstar