A friend of mine has one on his VW engined Colibri. Starts like the crack of a whip.Almost 20 years a a friend of mine, David Mickleburgh, developed an electronic ignition system for VWs in England. It has been used in quite a few aeroplanes over there and is still available. It has a built in advance curve making handpropping very easy. https://skycraft.ltd/docs/Leburg/EI10A_Electronic_Ignition_System.pdf
And the airplane's not bad, either! ;-) That's G-BMMF, active for almost 30 years and now resting comfortably in the South Wales Aviation Museum.Look how easy to hand prop Just like you have always said. Most likely
a distributor ignition. Big GRIN is priceless.