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| 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. |
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| 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. |
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| SHOVELHEAD |
| Type of engine. (V-Twin, produced from 1966 - 1984) |
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| SOFT TAIL |
| A 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. |
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| 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. |
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| SPORTBIKE |
| A focused motorcycle designed for speed and handling. These machines are usually equipped with aerodynamic bodywork. |
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| SPORTSTER |
| Harley-Davidson's entry level model is a popular model for both men and women riders. |
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| SPORT-TOURER |
| A 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. |
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| STANDARD |
| A motorcycle intended for general, all-around street use, typically with an upright seating posture and higher handlebars. |
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| STOCK |
| A motorcycle set up to OEM specifications with no alterations. |
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| SUPERCHARGER |
| A 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. |
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| SUPERMOTO |
| Generally, 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. |
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| SUZUKI |
| A brand of motorcycle produced in Japan. |
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