To discover exactly which parts you require use the on-line schematic exploded diagram - it will even give you some idea of where and how to fit those new parts.
The Yamaha DT50MX 1986 54Y NORWAY 2654Y-321E2 parts-list contains six hundred ninety-three parts.
thirty-six Yamaha DT50MX 1986 54Y NORWAY 2654Y-321E2 parts fiche schematic pages.
