The most reasonably priced component used on the Rmx250 1989 (k) Usa (e03) Cylinder is the Gasket(6.2x11x1).2 (nas).
A sample from the products for the Cylinder include: Gasket Set (nas), Gasket Set (nas), Gasket,cyl Cover No.1 (nas), Spark Plug Br9ev.
The sub assemblies and components that make up this Cylinder include this Cylinder Set, the most expensive part.