Some items from this specific schematic: Retainer,valve Spring, Washer, Screw,tappet Adjusting, Shaft,valve Rocker Arm Exhaust.
The most reasonably priced component used on the Dr250se 1990 (l) Usa (e03) Cam Shaft - Valve is the Pin(5x8).
The Suzuki CAM SHAFT - VALVE has thirty-nine products enlisted in the schematic.