STROKE (2-STROKE)An internal-combustion engine that requires only one revolution per cylinder or two piston strokes (up and down) to achieve a power stroke. Rarely used in automobiles.
STROKE (4-STROKE)An internal-combustion engine that requires two revolutions per cylinder or four piston strokes to achieve a power stroke, internal stroke, compression stroke, power stroke, exhaust stroke. More efficient than the two-stroke-cycle engine. Also called Otto cycle.
SHOVELHEADType of engine. (V-Twin, produced from 1966 - 1984)
SOFT TAILA Soft Tail is a motorcycle that appears to have a Hard Tail rear suspension, but in reality has shock absorbers that are hidden from view. Harley-Davidson has many Soft Tail models but they call them Softails.
SINGLE OVER HEAD CAM (SOHC)Single Over Head Cam. A single cam shaft found in the head or top of the engine that activates the valves.
SPORTBIKEA focused motorcycle designed for speed and handling. These machines are usually equipped with aerodynamic bodywork.
SPORTSTERHarley-Davidson's entry level model is a popular model for both men and women riders.
SPORT-TOURERA motorcycle that combines some of the handling and power of a sportbike, with some of the amenities of a touring bike, like saddlebags, comfortable ergonomics, etc. Not as focused as either a pure sportbike or a pure tourer.
STANDARDA motorcycle intended for general, all-around street use, typically with an upright seating posture and higher handlebars.
STOCKA motorcycle set up to OEM specifications with no alterations.
SUPERCHARGERA supercharger is used to increase the volume of air that an engine can take in, resulting in more power. It is run directly off of the engine by a drive belt.
SUPERMOTOGenerally, a style of motorcycle usually built around, and looking like, off-road machines with street tires. They tend to be very light, flickable machines, and are used in a new genre of racing that usually encompasses riding on a mixture of pavement and dirt surfaces.
SUZUKIA brand of motorcycle produced in Japan.