The Honda CM91 was also called C90M and Honda 90. It was sold 1966-69. It came in three colors with a white cowling: Black, White, and Scarlet Red. The side covers were also white. The fuel tank emblem reads "Honda 90". It had both an electric and kick starter. The engine was a 89cc OHC single cylinder; the transmission was a 3-speed with an automatic clutch.
- Spark Plug: NGK D8HA