The CB750K4 Four was sold in 1974 and was available in one of three colors: Flake Sunrise Orange, Freedom Green Metallic, or Boss Maroon Metallic. The gas tank stripes were white, gold and black. The side covers were smaller than the K0 model and there were no slots on the leading edge. The speedometer showed increments of 20 (i.e., 20, 40, 60, 80, etc.). The upper forks were chrome. The white tank pinstripe was wider than the K3 model. The headlight shell was black. The taillight and side reflectors were larger than the K1 model. There was a two-throttle cable system (pull open and pull closed). The exhaust system was a 4-into-4. The engine was a 736cc SOHC 2-valve dry sump inline 4 cylinder linked to a 5-speed transmission and chain drive. The serial number began CB750-2300001.