[Scrambler Bob]

My Honda 50 red-lined at 10500 rpm.

No turbo. And with pushrod activated valves.

Back in about 1965.

[Omnivore-Dan]

Impressive. What was the horsepower?

[airplaneguy]

Liter sport bikes spin up to 13,000-14,000 and produce around 186 BHP. So its not unheard of to get nearly 200 HP per liter.