The Kawasaki KX100 is a 2-stroke

Two-stroke cycle

A two-stroke engine is an internal combustion engine that completes the process cycle in one revolution of the crankshaft...

 motorcycle

Motorcycle

A motorcycle is a single-track, two-wheeled motor vehicle. Motorcycles vary considerably depending on the task for which they are designed, such as long distance travel, navigating congested urban traffic, cruising, sport and racing, or off-road conditions.Motorcycles are one of the most...

 manufactured by Kawasaki

Kawasaki Heavy Industries

is an international corporation based in Japan. It has headquarters in both Chūō-ku, Kobe and Minato, Tokyo.The company is named after its founder Shōzō Kawasaki and has no connection with the city of Kawasaki, Kanagawa....

. The bike offers a good transition between the traditional 85cc bikes and the 125cc bikes by having larger wheels (19 inch front, 16 inch rear, compared to 17/14 of normal 85's). Its predecessor is the KX80 bigwheel, which is still sold in the UK under the name "KX85 II".Longer travel suspension and larger bore size main differences between these bikes which otherwise are the same.

The KX100 can be raced in dedicated 100cc motocross

Motocross

Motocross is a form of motorcycle sport or all-terrain vehicle racing held on enclosed off road circuits. It evolved from trials, and was called scrambles, and later motocross, combining the French moto with cross-country...

classes, or open minicycle classes (such as Supermini in Canada, which allows up to 150cc 4-strokes and 85cc-112cc 2-strokes as of 2007). The KX100 can sometimes be raced in the 125cc class however, 100cc bikes are not very common.