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That is interesting. since the leverage that the handlebar lever exerts upon the piston, has it's own mechanical advantage, which should be taken into account when calculating the overall Mech adv.
So by applying more leverage to your larger piston, a similar mech adv. to that of my 13/29 set up is achieved. A higher mech adv will always produce less lift by it's nature.
The mechanical advantage of most cable systems will always be fairly similar to hydraulic systems in terms of lever travel to clutch lift. Unfortunately cables suffer from huge amounts of friction within, which is compounded by curves and poor lubrication. This is why they need more effort to pull, not because of poor mechanical advantage.
BTW I used an old brass spring balance with a sliding scale. I simply pulled the lever to about half it's travel with the balance and then held to take a steady reading.
The Commando uses a somewhat unique (in motorcycles) steel diaphragm spring, cut into central "fingers". This has the bizarre property of exerting a varying pressure at different points of it's deflection. It creates an "S" shaped graph of it's pressure as it goes beyond the "flat and pops the other way.
The trick of setting them up for a light clutch operation is to get the sweet spot of the spring by tuning the stack height..... Different strokes eh?
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