 Oil pressure is provided by the trochoidal pump, driven by a steel spur gear off the crankshaft.The main bearings, transmission main shaft, clutch bushing, shifter fork guide bar, and rocker arms are lubricated by pressurized oil, whereas the rest of the engine is lubricated by “oil splash, this includes the big ends .”

Pre-1980 models use the twin constant velocity Mikuni carburetors that can be tuned by moving the needle clip position, or by replacing jets.In the carburetors the velocity of the fuel mixture through the venturi, regulated by the opening of the butterfly valves and engine speed, causes a pressure difference between the top and the bottom of the carburetor pistons.