The Honda CB125 is a 122 cc motorcycle made by Honda from 1971–1985 (1973–1985 in the US). It had a single-cylinder overhead camshaft (OHC) engine with a 9500 rpm redline. The "S" model was produced from 1971 to 1975 and was replaced in 1976 by the "J" model (the US bikes retained the S designation). The newer model sported a two piece head, 124 cc displacement, and a larger carburettor.

Major changes

Aside from different color schemes and minor lettering differences, these are some of the major design changes:

US model year changes

Identifications, specifications, and changes throughout the years. This chart is for units sold In America only. This table explains the specific changes year to year. The components of the CB125 did not change much throughout the years unlike the appearance of the CB125. The majority of the changes made upon the bike was the color of the fuel tank, and the color of the decals. The color and Decals changed every year the Cb125 was produced.