Some items from this specific schematic: Ball, Governor Assy,exhaust Valve, Lever,exhaust Valve No.2, Retainer.
The most reasonably priced component used on the Rm250 1997 (v) Usa (e03) Exhaust Valve (model X/y) is the Ball.
With a quantity of four pieces, the Screw 5x12 is the most used part in the EXHAUST VALVE (MODEL X/Y) diagram.