With that much weight savings I’m thinking about switching. Then I can use a series/parallel switch and run the starter with 24 volts. They start much better on 24v and the starters last longer.
I used to have a double engine dirt late model, basically two Mazda rotary engines bolted together with one starter. 12v would not spin it over fast enough, 24v was great until it melted the solder in the brush connections. 18v ended up a workable compromise that didn't eat starters.
