This schematic depicts all components used in the Nsr250r9 1990 (l) Japan Mc21-102 E-4 partslist.
The E-4 assembly is constructed from several parts from which the Thermo Unit Assy is the most expensive.
A sample from the products for the E-4 include: Cover,water Pump, Gasket,water Pump, Thermo Unit Assy, Case,thermostat.
