Kawasaki G31M

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The Kawasakui G31M| (Centurian)] was a 100cc off-road motorcycle manufactured by Kawasaki from 1970 through 1971.

In the early 1970s the highly tuned G31M was a dominate force in scrambles, TT and motocross racing. This model consistently dominated the 100cc class with its unheard of 18.5 horsepower rated engine. The small tip on the expansion chamber gave the Centurion a distinct sound that is unmistakable to this day.

Specifications

Made from 1970-1971

  • 4490 units were made in 1970.
  • 100 cc
  • 2-Stroke, 1 Cylinder
  • Rotary Disc Valve (all steel disc as opposed to pressed fiber}.
G31M Crank Assembly
  • Rotary Disc Valve (steel instead of pressed fiber - original part #12001015)
  • 5-Speed Return Shift
  • Maximum Horsepower: 18.5 HP @ 10,250 rpm
  • Spark Plug: NGK B9HV
  • Tire Size
    • Front: 3.25-18 4PR
    • Rear: 3.25-18 4PR
  • Color
    • Fuel Tank: Lime Green
    • Front Fender: Aluminum
  • Engine No.: G31E00001-
  • Frame No.: G31-00001-
  • Parts Catalog No.: 99995- 113 plus 99995-175S
  • Shop Manual No.: 99995-201 (SM-1)
  • Remarks: Motocross type version of the G3TR. The carb cover on the 1971 Centurian had an air filter unique to this model allowing extra air intake.

Photo gallery

Kawasaki G31M
1970 Kawasaki G31M Centurion in Lime Green
1970 Kawasaki G31M Centurion in Lime Green
1970 Kawasaki G31M Centurion in Lime Green
1970 Kawasaki G31M Centurion in Lime Green



References