Three years ago, after 30 years of not having the starter working (or just barely bumping over engine),
I read about up-sizing the original battery cables one gauge. Really? That seemed too easy, but why not.
So I took the original battery/starter cables to a local battery shop and had them make me a set just like 'em
only one (or was it two?) gauge bigger. Add new battery, installed a working starter and wow!
electric start now turns over bike like never before. more importantly it starts the engine. reliably.
Knees are happy!