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Back in 1969 I bought a Norton N15 mortorcycle, a 750 cc bike. It had a 4700 microfarad, 63V capacitor across the battery terminals. With that one could kickstart this bike even without a battery. I did something like that with a Honda XR250L recently (putting in a cap and removing the battery), but it always needed three kicks to charge up the capacitor enough to run the ignition electronics. Also I needed to turn up the idle a bit as at low rpm generators don't put much out and the headlight has to be on.
Anyway a couple of things worry me about this supercap business. Having your capacitance cut down to 1/6 or 1/5 by using caps in series seems a huge waste. And I worry about the voltage spikes in the system. I wonder why Norton-Villiers put a 63V cap across the battery...
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