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The Honda Sport 90, Super 90, or S90, is a motorcycle produced by Honda from 1964 to 1969. [1] The Sport 90 was based on the Honda Super Cub and uses an 89.6 cc (5.47 cu in) single-cylinder OHC air-cooled engine. The engine links to a four-speed manual transmission. There is no tachometer but the speedometer indicates speed ranges for each gear.
four-stroke inline-4, DOHC, 16 valves, liquid-cooled Displacement 399 cc (24.3 cu in) Bore × stroke 55.0 mm × 42.0 mm (2.17 in × 1.65 in) Compression ratio 11.3:1 Fuel delivery Keihin VP22 32 mm carburetors ×4 Keihin VP04 32 mm carburetors ×4 Keihin VP04B 32 mm carburetors ×4 Keihin VP04B 32 mm carburetors ×4 Honda PGM-FI
The CB350F was available for two years until Honda announced the CB400F model. [5] For the most part, the CB400F was simply an upgraded version of the 350 model from the previous year. [5] [7] At the time Honda's R&D department had devoted much of its resources towards automobile models such as the Civic. This meant that motorbike development ...
Produced from 1961 onwards, the Honda 50 Sport (type C110 and C111) variant of the Super Cub, laid out the basics of all future models: It had a pressed-steel frame, hydraulic front and rear forks, a 49 cc (3.0 cu in) OHV four-stroke engine. The cylinder was laid horizontally to optimise cooling.
Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.
The 477 shares the 401's stroke with a larger 4 + 1 ⁄ 2 in (114.3 mm) bore; the 534 has this same bore with a stroke of 4.2 in (106.7 mm). The early Super Duty has a unique intake system where the intake plenum is connected directly to the cylinder head; all four cylinders pull the air/fuel mixture from a single "log" type port in the head.
Internal combustion engines operate through a sequence of strokes that admit and remove gases to and from the cylinder. These operations are repeated cyclically and an engine is said to be 2-stroke, 4-stroke or 6-stroke depending on the number of strokes it takes to complete a cycle. The most common type is 4-stroke, which has following cycles.
The CB-40 was re-engineered to overcome problems of vibration and cooling in the original design. [2] Suited for ultralight use and single seat light sport aircraft, the engine weighs 86 lbs and produces 40 hp (30 kW). The engine uses a short aluminum crankcase with redesigned oil galleries for improved lubrication.
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