Honda CB500 Four

CB500

Manufacturer	Honda
Also called	Honda CB500 Four K model
Production	1971–1973
Successor	Honda CB550
Class	Standard
Engine	498 cc (30.4 cu in) air cooled 8-valve SOHC transverse inline-four
Bore / stroke	56 mm × 50.6 mm (2.20 in × 1.99 in)
Compression ratio	9:1
Top speed	100 mph (160 km/h)[1]
Power	50 hp (37 kW) (claimed)[1]
Transmission	5-speed
Suspension	Front: 35 mm telescopic forks Rear: Twin shocks with adjustable pre-load
Brakes	Single front disc, rear drum
Tyres	Front: 3.25 x 19 in Rear: 3.50 x 18 in
Rake, trail	Rake: 64°, trail: 105 mm
Fuel capacity	14 L (3.1 imp gal; 3.7 US gal)

The Honda CB500 Four was a motorcycle introduced by Honda early in the 1970s, appearing at the London Racing and Sporting Motorcycle Show in February, 1972.^[2] It was similarly styled to the CB750, but smaller and lighter, with the manufacturer's claims of 50bhp output and a top speed of 115 mph.^[2][1]

Like the earlier CB750 it had 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.

Reviewing the 1972 show models, UK monthly magazine Motorcycle Mechanics described the CB500 as "one of the 'show stealers'. Four cylinders, in-line across the frame, four carburettors and single overhead camshaft motor, coupled to a five-speed gearbox give this 500 cc machine the performance of a 650 twin cylinder bike".^[2]

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.

Several CB500 machines were entered in the Production TT races on the Isle of Man in the early 1970s. Bill Smith won the 1973 500 cc TT Production race (four laps) riding one, 8.2 seconds ahead of second place Stan Woods mounted on a Suzuki T500 two-stroke, twin.^[3]

References