| MODEL | HONDA CB 450K1 1968 |
| Year | 1968 |
| Engine Type | Four stroke, parallel twin, DOHC, 2 valves per cylinder |
| Displacement / Capacity | 445 cc / 27.1 cu in |
| Bore X Stroke | 70 x 57.8 mm |
| Compression Ratio | 9.0:1 |
| Cooling System | Air cooled |
| Max Power | 32.8 kW / 45 hp @ 9000 rpm |
| Max Torque | 37.4 Nm / 27.6 lb-ft @ 7000 rpm |
| Ignition | Coil with auto-advance, twin contact breaker |
| Induction | 2x 32 mm Keihin carburettors |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Tubular semi-duplex cradle with single front down-tube |
| Front Suspension | Telescopic forks with two-way damping |
| Rear Suspension | Swing arm, shock absorbers with adjustable preload |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | 1300 mm / 51.2 in |
| Ground Clearance | — |
| Dry Weight | 187 kg / 412 lbs |
| Wet Weight | 204 kg / 449.7 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.25-18 |
| Rear Tyre | 3.50-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 14 Litres / 3.7 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 1968 K1 was the first major update of the CB450, bringing a five-speed gearbox, a restyled fuel tank, rubber fork gaiters in place of metal shrouds, and separate speedometer and rev-counter mounted above the headlamp. The engine kept its torsion-bar DOHC design and 45 hp rating. It gave the bike a more modern look in line with Honda's late-1960s range.
