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Honda CB 650

Make Model	Honda CB 650
Year	1980
Engine	Four stroke, transverse four cylinder, SOHC, 2 valves per cylinder
Capacity	626.8 cc / 38.2 cu-in
Bore x Stroke	59.8 x 55.8 mm
Cooling System	Air cooled
Compression Ratio	9.0:1
Induction	4x 26mm Keihin carburetors
Ignition	Transistorized
Starting	Electric
Max Power	63 hp / 46.9 kW @ 9000 rpm
Max Torque	51.5 Nm / 38 ft-lb @ 8000 rpm
Transmission	5 Speed
Final Drive	Chain
Front Suspension	Centre axle coil spring forks
Front Wheel Travel	135 mm / 5.3 in
Rear Suspension	Dual Showa dampers. adjustable spring preload.
Rear Wheel Travel	91 mm / 3.5 in
Front Brakes	Single 275mm disc, 1 piston caliper
Rear Brakes	180mm Drum
Front Tyre	3.50-19
Rear Tyre	4.50-17
Wet Weight	212 kg / 467.3 lbs
Fuel Capacity	18 Litres / 4.7 US gal
Consumption Average	41.1 mpg
Standing ¼ Mile	13.4 sec / 157.7 km/h
Top Speed	190 km/h

The year is 1978, model-year 1979, and Honda eliminates their Single OverHead-Cam Four-Cylinder (SOHC/4) CB550 and CB750 streetbikes from their offerings. Since 1969 Honda's SOHC/4 design had captured the hearts and minds of critic and consumer alike. Beginning with the Harley-killing CB750, Honda's reign on this engine technology would last until 1982, the year the Nighthawk moniker is introduced as the CB650SC. The 1979 CB550 and CB750 grow up and get themselves, among other things, a second camshaft.

The SOHC/4 replacement is the CB650, which, to some, seems little more than a cubic-centimeter compromise. To others, it's a last gasp at an engine technology that, approaching the early 80's, is quickly bound for antiquity in the high-horsepower attitude of the late-70's/early-80's streetbike market. For many owners, these bikes are examples of the perfect middle-weight pocket-rocket. In any event, the SOHC/4 CB650's are truly the culmination of Honda's decade of experience with their ground-breaking SOHC/4 design. ...