The Kawasaki KMX is a popular water-cooled 2-stroke trail bike. There are two versions, the KMX 125 cc and the larger 200 cc edition.

The KMX 125 and 200 were the start of a new era in terms of trail bike terms, they both feature superb strong front and rear disc brakes, water-cooled engines, mono link suspension (Kawasaki's UNI-TRACK system) and a power valve system (KIPS).

KMX 125

1986-2003

Models: A1-A5/B1-B12

The 125 cc version is greatly loved by a wider range of ages, easily the most popular as these can be ridden in some countries with just a provisional license as they come restricted to 12 bhp (learner legal spec.)

They are renowned for being quick bikes once de-restricted and the power will be increased to over 20 bhp at the rear wheel easily reaching 85 mph with some modifications to the gearing ratio (sprockets). The KIPS power valve system used on the engine is arguably better than some rival bikes such as the YPVS used on Yamaha

Yamaha

Yamaha may refer to:* Yamaha Corporation, a Japanese company with a wide range of products and services** Yamaha Motor Company, a Japanese motorized vehicle-producing company...

's DTR trail 125 cc bike.

Specifications of restricted 'B' model;
Top speed 71 mph
1/4-mile acceleration 18.4 secs
Power 12 bhp
Torque 9ftlb
Weight 110 kg
Seat height 865 mm
Fuel capacity 9 litres
Average fuel consumption 55mpg
Tank range 110 miles
Insurance group 5
Engine size 124 cc
Engine specification. Water-cooled, Single-cylinder 2 Stroke, 6 gears.
Frame Tubular steel cradle
Front suspension adjustment None
Rear suspension adjustment Preload
Front brakes Single 230 mm disc
Rear brake 210 mm disc
Front tyre size 2.75 x 21
Rear tyre size 4.10 x 18