The Honda CB500 Four is a standard 498 cc (30.4 cu in), air-cooled, 8-valve, SOHC, transverse inline-four motorcycle made by Honda from 1971 to 1978.It was introduced at the London Racing and Sporting Motorcycle Show in February 1972, and sold in the US market until 1973, replaced by the CB550 in the 1974 model year.
The CB500 Four is styled like the CB750, but smaller and lighter, with a claimed of 50 bhp (37 kW) output and a top speed of 115 mph (185 km/h).
Like the earlier CB750 it has a single front hydraulic disc brake, rear drum brake, electric starter, and sohc eight-valve engine.
The four-into-four exhaust pipes echoed those of the CB750. Unlike the earlier dry sump CB750, the smaller bike has a wet sump engine. Also, the primary drives were different, the CB750 having a duplex chain, while the CB500 had a “Hy-Vo” Morse chain.//wikipedia