Hi Alan,
I think you have the wrong end of the stick! NicoV's question is clear enough, he simply wants to know if using a capacitor as a battery eliminator will still work if the bike has a Boyer Bransden electronic ignition installed instead of points ignition. No mention of electric start, as this is obviously(?) a kick-start only option! If the alternator chucks out enough juice at kick-starting revs you don't need to have a battery, just the capacitor. We know this works on 12V points-fitted bikes with an strong enough alternator as Lucas used to sell their 2MC capacitor for this very purpose.
BUT if the bike has electronic (TCI rather than CDI) ignition fitted, which can be a lot fussier in terms of required voltage, will this STILL work?
The answer to this depends on how good the alternator is and/or how tolerant the TCI box is of lower voltages.
For more on the use of capacitors as battery eliminators have a look here:
http://www.rexs-speedshop.com/epages/es ... oducts/BE1
http://www.rexs-speedshop.com/epages/es ... oducts/BE2
Our hosts don't list them in their accessories but they DO sell the Boyer Bransden Power Box, which is a reg/rectifier with the capacitor built in.
A.