Back in my VeeWee days, we'd convert the old 6volt VW's to 12 volt but leave the 6 volt starter. ZZZZIIP ! Man would they spin over fast ! If the tuneup was good ,they'd pop off within a second or two. If the tune was bad you could burn down the starter pretty quick.
What do you do for all the 12 volt gauges and electronics when converted to 16v?