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INTRODUCTION

PARTS OF A MOTORCYCLE
Engine
Ignition and Fuel Delivery System
Transmission
Brakes
Frame and Suspension System
Seats and Accessories

KINDS OF MOTORCYCLES
Street Motorcycles
Off-Road Motorcycles
Racing Motorcycles

HISTORY




Motorbike
Motorcycle Racing


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Off-Road Motorcycles




Motorcycles used in motocross racing are modified to improve off-road performance and handling. The motorcycle pictured here has a light, powerful engine; large wheels with knobby tires for improved traction; and flat, wide handlebars to maximize the racerís control in bumpy terrain. A racerís gear is equally important. It must protect against injury without trapping body heat or overly restricting movement. Racers wear ventilated helmets, plastic body armor, heavy gloves, flat-soled boots, and knee pads.

In comparison to street motorcycles, off-road motorcycles have narrower, lighter frames, increased ground clearance, and sophisticated suspension systems. Most are powered by single cylinder, two-stroke or four-stroke engines with displacements ranging from 250 to 500 cc. They often have a kick-starter rather than an electric starter to reduce weight. Large diameter tires with a knobby tread pattern provide increased traction, and a large gear on the rear wheel multiplies engine torque for climbing hills. Straight, wide handlebars provide extra leverage. If used strictly for off-road riding, the cycle may not have lights, mirrors, a horn, or a muffler. Most off-road motorcycles have flexible plastic fenders and fuel tanks to minimize damage in the event of a fall. Riders typically wear extra protective gear, including chest, knee, elbow, and shin protectors.

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