Because everyone knew that Fonzie rode a CB750!
In uhmmm... 1958?
with apologies to Ogden Nash...

This is interesting, a linen measuring tape in a nice Bakelite case from the mid 20th century Peoples Republic of China. Looking online, the length apparently is either 20 or 30 meters. The brand name Tricle, probably doesn't translate well from the Chinese.
Displayed at a local antique market, this intriguingly shaped thing wasn't identified. It's all metal and about 3 feet in diameter. My overactive mind pictures it as the outlet portion of a jet engine but what is it really? Ideas?
Wartime R75 BMW with drive to sidecar wheel . The helmet shaped thing on the tank is an air filter. 18,000 units were made before production ended in 1944.
How do you create two separate airtight crankcase chambers with an inline twin throw crankshaft. Most Japanese engines were simple horizontally split crankcase halves with a drop-in built-up crankshaft.
Excelsior did it earlier by bolting three sections together vertically and coupling two crankshafts together. In 1958 the engine was developed into a 500cc triple that was used in the Berkley sports car.