Honda CRF 450 05-08 Stage 1 Carb mod rejetted bog free and easier starting (does not include rebuild parts) TLR Valve springs Recondition head (clean, inspect and recut seats) Head Gasket and valve guide seals Hi flow cut exhuast valves OEM intake valves Stage 2 Includes 1 plus: Porting Stage 3 (race gas only) Includes 1-2 plus: TLR intake valves Hi comp piston (Wiseco) Hone and lap cylinder (cleaned and prepped) Base gasket Stage 4 (race gas only) Includes 1-2-3 plus: TLR billit cam TLR race piston (Wiseco) Install seats with (Hi flow valve seat cutting) NOTE: To maintain proper performance the most over looked part is the cam chain. When ever you do a top end it would be wise to change the cam chain.