The Colleda CO is Suzuki’s first true motorcycle. Unlike previous models powered by bicycle engines (or “cycle motors”), this model combined a stamped channel frame with a 90 cm³ 4-stroke OHV 1-cylinder engine generating horsepower of 3 PS. This engine featured a flywheel magnet equipped with automatic spark advance to control the ignition timing for the first time. It was also the first model in Japan to include a speedometer. The engine was paired with the first rotary 3-speed transmission adopted on a motorcycle. The Colleda CO is also notable for its refined chassis design, which included features such as a 7-liter capacity teardrop-shaped fuel tank. This model was known as the CO-L. The CO-K version was also developed featuring a pipe frame and engine cover.

The changes to Japan’s motorcycle license system that accompanied the revisions to the Road Traffic Act in 1954, accelerated the domination of 125 cm³ models in the 51 to 125 cm³ class. The Colleda COX was developed in response to this trend as a minor change of the Colleda CO by widening the bore of the 90 cm³ 4-stroke air-cooled OHV engine of that model to raise displacement to 125 cm³. Other components, such as the crankshaft bearings, were also improved, resulting in a top speed of 75 km/h and maximum horsepower of 4 PS.