Starting at bottom right and moving clockwise: 1. L.H. main case cover with tachometer drive. 2. Small cover over drive sprocket and rear mounting screw provision for magneto cover. 3. R.H. Magneto cover with clutch adjuster under the small round chrome cover. 4. R.H. main case. 5&6. L&R inner crankcases. These fit into the main cases and hold the crank halves. The crankshaft is two piece and each half is pressed into these small cases. When these small cases are unscrewed from the maincases, the mechanic can pull them out along with the crank half and rod. Of course the cylinder and piston must be removed first. This is a great idea, much easier to work on than a normal twin. You can replace one side or the whole crank without removing the engine from the frame or spliting the cases. Wonderful feature at the racetrack where time is never on your side. Crank can be replaced in minutes, not hours.

 

Another interesting and unusual feature of this engine is the placement of the gear shafts. They are stacked vertically, one on top of the other!

Gearshafts are always one behind the other with the counter shaft or driveshaft with sprocket at the rear. The clutch mounts on the forward shaft. Not the Asama! It makes for a very long chain!