The hallmark of the Norton Commando frame is the unique principle of the Isolastic system, where the engine, gearbox, and swinging arm are assembled as one unit and rubber-mounted to the chassis. The original arrangement required shims to achieve the ideal side play of .006″- .010″ between the plastic washer and adjusting collar but was upgraded to a Vernier-adjustable system for the 1975 MK3 models.
This genuine Andover replacement front Isolastic kit is designed for direct fitment to the 1975 Commando 850 models with the longer center tube. The kit is supplied with all of the necessary parts to renew the front engine mounting assembly, including the collar adjusting tool. Not recommended for fitment to the earlier MK1 or MK2 models. Made in the UK.
The complete Isolastic assembly is designed to neutralize engine vibration transmitted through the frame, effectively isolating the rider from fatigue-inducing high frequency vibration. The Vernier adjustable system adopted for the MK3 models eliminates the tedious task of shimming to achieve the correct clearance.
The adjustment of the installed Isolastic assembly is critical to enjoying the full benefit of the chassis design. The entire process of removal and installation of the front Isolastic assembly is outlined in great detail in the factory workshop manual and should be carefully followed to ensure correct fitment.
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