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  The Honda XL 100 line of motorcycles was first introduced in 1974. The XL100K0 was the first model, followed by the XL100K1 in 1975. From 1975 to 1978, the bike was simply called the XL100. In 1979, the XL100S variant was introduced. The XL100S remained in production until 1985 and experienced subtle changes with each model year. Variations in the design of the 1981 XL100S gave it a look that was more similar to a small street bike than a trail bike. These included a new paint scheme, decals and redesigned side panels.
  
  

Engine and Fuel Delivery

• The 1981 XL100 had a four-stroke, single-cylinder overhead-cam engine. The engine's displacement was 99 cubic centimeters, which gave it enough power to carry one average adult rider without concern, but adding a passenger sometimes caused it to accelerate more slowly and reach lower top speeds. The bike was started with a forward kick-starter. It had a five-speed manual transmission.
  
  

Body Type

• The XL100 featured a headlamp, brake lights and turn signals which made it legal to ride on streets as well as off-road tracks. The 1981 model came in Monza Red with black trim, a black frame and black side panels. The seat was large enough to accommodate a rider and passenger. The bike's smaller frame and shorter wheelbase allowed it to corner and handle well under most off-road conditions. A large front fender protected the driver from mud, water or other liquids that might otherwise have soaked the driver or impaired his vision.
  
  

Suspension and Tires

• The suspension was designed for off-road settings, so it was more stiff than the suspensions on comparably sized street bikes and scooters. The front wheel was 19 inches and the rear wheel was 16 inches. It featured front and rear disk brakes. The front brake was operated by hand using a lever on the right handle and the rear brake was operated using a right foot pedal.