After the crankshaft is taken out it is easy to remove the gearbox cluster together with the gear shift drum. But first you have to remove the rubber cap on the left above the sprocket. Then remove the circlip which holds the shiftdrum by 2 half-round segments. Later-on, during building the engine, we fit the 2 gearboxshafts also together with the shift-drum as one unit.

Yamaha CS2E gearshiftdrum

All parts can be cleaned now and stored away for later.