This is from the site Bring a Trailer (https://bringatrailer.com/) ...
This 1966 Honda S90 is powered by a 90cc SOHC single-cylinder paired with a 4-speed transmission and was purchased by the seller one year ago out of long term indoor storage. The bike is finished in black with silver fenders, and maintenance has included replacement of the tires under previous ownership and a new battery added by the seller. 301 miles are currently shown, of which the seller has added only one. This S90 is offered by the selling dealer at no reserve with the owner’s manual, factory tool kit, a California black plate, and a clean California title.
The S90 weighed only 176 pounds dry and featured a pressed steel frame, chrome fuel tank panels, and 18 inch wheels. This example is finished in black with silver fenders, and the included California black plate wears a registration sticker from 1990. Various scratches are visible on the bodywork, the seat cover is torn, and corrosion is noted inside the fuel tank. The tires were replaced under previous ownership and the seller recently added a new battery.
The headlight shell contains an 80-mph Nippon Seiki speedometer with shift points indicated on the face. 301 miles are currently shown, of which the seller has added only one.
Power comes from a 90cc SOHC single with a 4-speed transmission. The all alloy engine was factory rated at 8 horsepower and the transmission is equipped with a mutli-plate wet clutch and a heel and toe shift lever. Little is known of the early history and no service records are available.
The factory supplied tool kit is included along with the owner’s manual.