A 1972 CB750K2 in Brier Brown Metallic…
The ground breaking Honda CB750 was introduced to the world in 1969 as the first mass produced 4 cylinder motorcycle. The 1969 models are commonly referred to as the K0 model and there were evolutionary changes every year of the 10 years the K model was produced. By 1972 the model designation was CB750K2. Production had risen from 53,400 units in the 1969-1970 selling season to 63,500 units in 1972. Visually the K2 appeared to be little changed from the ‘69 model but after doing some research I found that there were in fact quite a few changes.
Sales: Peak year for CB750 sales was the 1971 K1 model and the lowest sales year was 1975 K5 model. The low number for 1975 production is even more interesting when you consider that more motorcycles were sold in the USA in 1975 than any year before or since.
An interesting note about the CB750 colors; not only did color choices change every year as you would expect, but the number of color choices available each model year also varied. The original K0 was offered in two colors, the K1 was offered in five colors, the K2 was back to two color choices, the K3 & K4 offered 3 colors, the K5 offered in two colors and the K6 was only available in one color and the final two years of the SOHC 750s, the K7 & K8 were again offered in two color choices.
Restricted 341 series mufflers that were quieter than earlier 300 series. These mufflers were used from 1972 through 1976. Baffles in the lower half of the air box to reduce intake noise which were also more restrictive.
Sprocket change: Front sprocket went from a 17 to 18 tooth and the rear remained the same at 48 teeth.
Rear shocks were altered.
Metal chain guard rather than the previous plastic version.
New swingarm design.
New front disc rotor, used through 1975.
New warning light panel between the instruments. Warning lights panel was unique to K2 with “flash” for the turn signals signals and “neut” for neutral light.
The instruments went from plastic cases to metal cases with glass lenses and the warning lights were no longer in the instruments.
New larger tail light first used on the K2. New tail light bracket. New rear fender with mounting holes in a different place for the new tail light bracket
Unique handlebars that were only used for 1972. They were the narrowest ever used on a K model at 28.25” with the lowest rise of any year at 3” and the least pullback at 4”.
New style hand gripsKey operated seat latch. (some late K1s had the key).
Turn signal buzzer. Only 1972 had a button on the bottom of the left handlebar switch to mute the buzzer.
Rear grab rail added.
Rear turn signals now mounted to the grab rail instead for the frame as was on the K0 & K1.
Plastic document compartment added to the underside of the seat where the owner’s manual and registration papers could be stored.
Headlight shell is black, no longer color matched to the tank and side covers.
The headlight mounts, sometimes called fork ears are no longer color matched to the tank and side covers but are now chrome plated.
Reflectors on the forks were a larger diameter.
Seat pattern and shape was changed on the K2 model and remained the same through the K6.
Colors offered in 1972 were: Briar Brown Metallic and Flake Sunrise Orange
This particular bike is available for sale here.