Yeah, they're badass. Stupid power from a 2-stroke inline 4 with a light switch powerband.
Then they mounted it in a 'dirt bike' chassis made of thin walled conduit.
I've had a couple of those come by me at Road Atlanta like I was standing still
....while running over 150mph. Good god man, that sound at full honk in real life.
I'd love to put one of those engines in a modern chassis for a streetbike.
Watch the actual race from the 70's when he scared the living shit out of the Hardly factory team that was 'supposed' to finish 1-2-3. That's a serious ass whipping.
"When they heard it, it was too late" LOL
https://www.youtube.com/watch?v=dpsZ_AUFbX4&t=51s