Mmmmm ...
John might well be correct on this ....
... having said that never had an issue starting the Twin Squirell or the Bo105 with the same engines and the same generators (Lear Seigler) with I seem to remember the same generator drive shafts .... so perhaps it has more to do with the starter/generator cooling I have seen these starters melt down their commutators due to overheating during a prolonged start ...
