Honda Sport 90
|Also called||Honda S90, Honda CS90, Honda Sport 90, Honda Super 90, Honda Benly 90, S90Z.|
|Engine||89.6 cc (5.47 cu in) SOHC 2-valve 4-stroke, air-cooled|
|Transmission||manual 4-speed; chain final drive|
|Brakes||Front and Rear, Internal Expansion Type (drum)|
|Tires||front and rear 2.50-18, 4 ply|
|Wheelbase||1.195 m (3 ft 11.0 in)|
|Dimensions||L: 1.89 m (6 ft 2 in)
W: 0.65 m (2 ft 2 in)
H: 0.98 m (3 ft 3 in)
|Fuel capacity||7 l (1.5 imp gal; 1.8 US gal)|
The Honda Sport 90, Super 90, or S90, was a 90 cc Honda motorcycle ultra lightweight new design motorcycle, the engine based on the Honda Super Cub, and was made from 1964 to 1969. The motorcycle continued in production In various forms for example the S90Z in Indonesia. 
The single cylinder OHC air-cooled engine linked to a four speed transmission. It had a hand clutch, and shifting was "1 down, 3 up," with neutral in between 1st and 2nd. There was no tachometer but the speedometer indicated speed ranges for each gear. The top speed was claimed to be 64 mph, and the engine was rated at 8 horsepower.
The engine held a quart of oil and had an internal centrifugal oil filter, and the exhaust had a removable baffle. A metal cylinder behind the carburetor held the air filter. Tools went under the seat in their own compartment. 
The frame was pressed steel rather than tubular steel to minimize weight and the bike was fitted with telescopic front forks for improved road holding. The motorcycle was not intended for off road use, as evidenced by the narrow handle bars and street tires; it included no accessories for such travel. 90 miles per US gallon (38 km/l) was not hard to attain, even with spirited riding.
There are a variety of models including the Honda S90, CS90, and the Benly 90. The date of manufacturing can be determined by removing the fuel tank and examining the tag surrounding the wiring harness.