When Norton flipped the Mk2 disc to the left side (317xxx)...

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Fast Eddie questioned the effects of the relatively light weight of the master cylinder, but, keep in mind, it's the furthest from the pivot point, thus having the greatest effect. He also noted that when the caliper/rotor was moved to the left, if you factor the individual component's weights versus their relative difference from the pivot point, they just might balance out (my thoughts also).
Starting with the '69 CB750, most (all?) Jap bikes with disc brakes had the calipers in front. In the later 70's, they'd moved them behind the legs, putting the mass closer to the pivot. I specifically remember them advertising that very point as a means to help lighten the steering effort. That alone tells me the caliper/disc combo must have a pretty heavy effect on the front end geometry.
Alright, as soon as I get my clutch cable replaced (gr-r-r!), I'm going to start strapping lead weights to the left grip area until the front end no longer flops over when on the center stand, then take her for a ride. This should prove out the theory of all the mass being on the right side causing the left-hand drift, allowing us to get on to other equally important worldly matters!

Nathan
 
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