Honda CB 450 MKIII


Make Model

Honda CB 450 MKIII




Air cooled, parallel twin cylinder, four stroke, DOHC, 2 valves per cylinder,


Bore x Stroke 70 x 57.8 mm
Compression Ratio 9.0:1


Ignition  /  Starting

Max Power

45 CV @ 9000 rpm

Max Torque

4 kgf-m @ 7000 rpm

Transmission  /  Drive

5 Speed  /  chain

Front Suspension

Rear Suspension

Front Brakes


Rear Brakes


Front Tyre


Rear Tyre


Dry Weight

Fuel Capacity 

14 Litres
Top Speed

171 km/h

In 1965, a few years before the year 0 marked by the appearance of the CB 750 Four, the English with brands such as Triumph, BSA or Norton reign supreme on the world of motorcycle engine high (for time) . It is in this context that Honda bold designs a machine: a bi-cylinder (so far everything is normal), set to 180 degrees (the English are braced to 360 °), super square (English engines are long course), 450 cm3 (the engine is lower than the competition) and dual Camshaft (English engines are generally abased).

The benefits of technology implementation are obvious:

- Engine stalled at 180 °: it vibrates less.

- Engine super square: the linear velocity of piston is lower than on a long motor racing. This type of engine supports more senior regimes and therefore wears more slowly in the same activities. The senior plans to deliver more power.

- Double Camshaft: the engine can take the tours that are permitted by its technology super-square valves without panic.

If nothing new is still a concentrate of technology. With this engine, Honda commercial machine that sports competition is very difficult to counter. The press greeted the arrival of the machine so unanimous.

At its output, the machine is referenced (K0), the engine has a 4 speed box, replaced in 1968 (by the model K1) with a 5 speed box. The machine also deeply moving to an aesthetic point of view. We may consider CB 450 K1 as a new machine in its own right. 450 BC K0 gave the appearance of a machine 70s, the K1 is already much closer to the style of the 80s.

In 1970, the machine will get these lines definitive illustrated below by the model K5. In this configuration, machine incorporates the general lines of the Honda CB 750, spearheaded at that time, the Honda range.