HD Flathead Koslow OHV Conversion by @loveless_performance, USA. @boltlondon

[@ToddsHouseofSpeed-uq5sp]

Man - how cool is that thing?

[@LordMekanicus]

See the sparks out the exhaust? It's running lean and detonating. The sparks are bits of piston.

[@AbdulKhan-ew8ce]

Did he just put a bullet into a motorcycle to make it pop

[@bowl-of-chicken-soup7107]

It’s how you start the bike

[@LordMekanicus]

A lot of aircraft were started the same way. Search "Shotgun Start."

[@LordMekanicus]

A lot of tractors and aircraft were started the same way in that Era. Search "shotgun start."