Honda CB750 bike (1968)

The Honda CB750 Four K Prototype, released in 1968, is a four-stroke, transverse four-cylinder bike featuring a SOHC (single overhead camshaft) and two valves per cylinder. The 736cc engine has a compression ratio of 9.0:1 and is air-cooled. The bike has 4x28mm Keihin carbs with ignition from a battery and coils; it features both electric and kick start capabilities. Max power is 50 kW / 67 hp at 8000 rpm, with a max torque of 44 lb-ft / 60 Nm at 7000 rpm. The bike has a multi-plate, wet clutch and a 5-speed transmission with a final chain drive. The CB750 Four K has a tubular steel duplex cradle frame, telescopic forks in the front, a swingarm with dual shocks (preload adjustable) in the back, and a single 296 mm disc brake in the front with a 179 mm drum brake in the back. The bike’s wheelbase is 1453 mm / 57.2 in with a seat height of 800 mm / 31.5 in, and a ground clearance of 160 mm / 6.3 in. It has a wet weight of 226 kg / 499 lbs with an 18.2 L / 4.8 US gal fuel capacity and 3.3 L / 7 US pints oil capacity. The fuel consumption average is 6.9 L/100 km / 14.6 km/l / 34.3 US mpg. The bike can brake from 48 km/h / 30 mph – 0 in 10 m / 32.9 ft and from 97 km/h / 60 mph – 0 in 41 m / 135.7 ft. The bike can do a quarter-mile in 13.5 sec / 100.9 mph, with a top speed of 198 km/h / 123.2 mph. It comes in a candy blue/green color.

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Technical specifications:

Make Model: Honda CB 750 Four K Prototype

Year: 1968

Engine: Four stroke, transverse four cylinder, SOHC, 2 valve per cylinder.

Capacity: 736 cc / 44.9 cub in.

Bore x Stroke: 61 63 mm

Compression Ratio: 9.0:1

Cooling System: Air cooled

Lubrication: Dry sump

Induction: 4 x 28 mm Keihin carbs

Ignition: Battery, coils

Starting: Electric, kick

Max Power: 50 kW / 67 hp @ 8000 rpm

Max Torque: 44 lb-ft / 60 Nm @ 7000 rpm

Clutch: Multi-plate, wet

Transmission: 5 Speed

Final Drive: Chain

Gear Ratios: 1st 13.99 / 2nd 9.54 / 3rd 7.45 / 4th 6.14 / 5th 5.26:1

Frame: Tubular steal duplex cradle

Front Suspension: Telescopic forks non adjustable.

Rear Suspension: Swingarm, dual shocks, preload adjustable.

Front Brake: Single 296 mm disc

Rear Brake: 179 mm Drum

Front Tyre: 3.25-19

Rear Tyre: 4.00-18

Wheelbase: 1453 mm / 57.2 in.

Seat Height: 800 mm / 31.5 in.

Ground Clearance: 160 mm / 6.3 in.

Wet Weight: 226 kg / 499 lbs

Fuel Capacity: 18.2 L / 4.8 US gal

Oil Capacity: 3.3 L / 7 US pints

Consumption Average: 6.9 L/100 km / 14.6 km/l / 34.3 US mpg

Braking Distance 48 km/h / 30 mph – 0: 10 m / 32.9 ft

Braking Distance 97 km/h / 60 mph – 0: 41 m / 135.7 ft

Standing 1/4 Mile: 13.5 sec / 100.9 mph

Top Speed: 198 km/h / 123.2 mph

Colour: Candy blue/green