TOPIC: Isolastic evolution

The commando isolastics did evolve as the 8 year production ran. Flexible compliance to minimize coupling to the rider is the main goal, yet minimizing the flexible flyer handling is an additional important goal.
The front, rear and top isolastic each add there own characteristics to the vibration mode and resonances and handling.

nutate :oscillatory movement of the axis of a rotating body.

To be very specific, the nutation energy comes from rotation of the 22 lb. flywheel, ocillating connecting rod and vertical piston movements. The energy is transmitted to the whole rubber mounted power plant, engine-transmission and cradle through the crankshaft main bearings.

The iso's have two functional components. INNER column and OUTER column
The inner column is hard bolted solid to the frame tabs.
The outer column is held off the rigid frame via rubber ISO mounts.
The internal rubber components provide compliant connection and support between the inner and outer columns.

The inner mount is comprised of stacked component on the center bolt. All together they comprise the "stacked length" between the two 06-0422 front engine mounting collars These collars also restrict movement of the 06-3556 PTFE or urethane washers during drive train nutating motion.

The outer column floats on the rubber iso's installed in the 06-1410 front engine mounting. This body and two tube caps are shorter then the inner column. The "freeplay" between the inner and outer columns is adjustable using selected captive shims to reduce the gap to the desired amount. Typically 0.010" or less.