I have a 1943 GPW with a 12 volt conversion. Not fitted by me, it's the way it came. It has the original type of 6 volt starter which most of the time works fine but occasionally makes either a terrible graunching noise or just fails to engage and whirrs away. The problem is more prevalent when the engine is warm. There is a new ring gear on the flywheel, fitted as part of a recent engine rebuilt, and a new spindle bush in the bell housing. I've cleaned and inspected the starter, everything looks fine and moves the way it should do.
I've read conflicting stories about using a 6 volt starter on 12 volts, some people say there's no problem, others say that the over-rapid engagement will prematurely destroy the gears. I've also read that fitting a stronger bendix spring can be beneficial. Also been told that the original starters were better made than modern replacements and if I have one I should endeavour to keep it.
So, any advice please?
Thanks, John