1974 Honda CB 550K

Honda CB 550K

Make Model	Honda CB 550K
Year	1974 -
Engine	Four stroke, transverse four cylinder, SOHC, 2 valves per cylinder
Capacity	544 cc / 33.1 cu-in
Bore x Stroke	58.5 x 50.6 mm
Cooling System	Air cooled
Compression Ratio	9.0:1
Induction	4x Keihin, 22 mm carburetors
Ignition	Battery, with points
Starting	Electric & kick
Max Power	50 hp / 36.5 kW @ 8500 rpm
Max Torque	43.1 Nm / 31.8 lb-ft @ 7400 rpm
Transmission	5 Speed
Final Drive	Chain
Frame	Double cradle tubular steal
Front Suspension	35mm Telescopic hydraulic forks
Rear Suspension	Dual shocks, lateral adjustable preload
Front Brakes	Single 270mm disc
Rear Brakes	Drum
Front Tyre	3.25-19
Rear Tyre	3.75-18
Rake	64°
Trail	105 mm / 4.1 ub
Wheelbase	1405 mm / 55.3 in
Seat Height	805 mm / 31.7 in
Dry Weight	191 kg / 421 lbs
Wet Weight	206.0 kg / 454.2 lbs
Fuel Capacity	14 Litres / 3.7 US gal
Consumption Average	41 mpg
Braking 60 - 0 / 100 - 0	- / 44.5 m
Standing ¼ Mile	14.5 sec / 144.2 km/h
Top Speed	164 km/h / 102 mph
Road Test	Wikipedia

The Honda CB550 is a 544 cc (33.2 cu in) standard motorcycle made by Honda from 1974 to 1978. It has a four-cylinder SOHC air-cooled wet sump engine. The first version, the CB550K, was a development of the earlier CB500, and like its predecessor, had four exhaust pipes, four silencers and wire-spoked wheels.

Model development

Compared to Honda's 1969 dry sump CB750, both the CB500 and the CB550 were much smaller and lighter. The CB550K shared some visual similarities with the CB750, and it fitted into Honda's four-cylinder range as its mid-capacity bike.

From 1975 to 1977, a second version of the CB550 was offered, the CB550F "Super Sport". The CB550K and CB550F were sold alongside each other, sharing a similar engine, instruments, lights, wheels, brakes, and frame. The CB550F has a lighter four-into-one exhaust, slightly flatter handlebars, and a different fuel tank without chrome trim. The CB550F is part of the Honda Super Sport range, along with the CB400F, an CB750F. The F (aka F1) was succeeded by the F2, which had an additional flash decal on the fuel tank and deletion of the fork gaiters.

Both CB550F and CB550K models had a drum rear brake and a single front disc brake, although each fork slider had a bracket for a brake caliper. The CB550K went through some minor iterations, the last being the CB550K4. Closely derived from the earlier CB500, the CB550's engine was the largest factory boring of this cylinder block; and when the CB550 was replaced in 1979 by the broadly similar Honda CB650, a completely new engine design was necessary.

Cycle Test magazine recorded a 0 to 1⁄4 mi (0.00 to 0.40 km) time of 14.47 seconds at 93.36 mph (150.25 km/h) in a September 1975 test of the CB550F Super Sport. The engine output was 38.38 bhp (28.62 kW) at 8,000 rpm and 26.04 lbf⋅ft (35.31 N⋅m) torque at 7,000 rpm, with a curb weight of 455 lb (206 kg) and average fuel consumption of 5.9 L/100 km; 48 mpg‑imp (40 mpg‑US)