The most reasonably priced component used on the Mt50f 1990 (l) European Direct Sales Crankshaft/piston is the Clip,piston 12mm.
Check out any of the twenty-six Crankshaft/piston components enlisted.
Parts such as the Crankshaft/piston: Shaft,bal.idle, Needle Brg, Needle Brg, Piston B (std) are included in the Mt50f 1990 (l) European Direct Sales Crankshaft/piston parts fiche.