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In the early 1970s the highly tuned G31M was a dominate force in Flat Track, Tourist Trophy, and motocross events on relatively smooth tracks. The “Baby Greenstreak” as it was often called, put out an astounding 18.5 horsepower at 13,000 rpm's. The small tip or “stinger” on the expansion chamber gave the Centurian a distinct sound that is unmistakable to this day. The engine case was slightly different than other Kawasaki's with the G31M having a secondary air intake on the carburetor cover. It also required the use of bean oil as a fuel additive for lubrication. Even then, lower end life was short because of the engines high rpm's.
Actor Steve McQueen was given six G31M bikes by Kawasaki for the filming of the motion picture, LeMans. McQueen kept one for himself and painted it orange with gold stripes and gave it the name “Ringadingdoo.” The bike sold at an auction held at the Petersen Museum in Los Angeles in November of 2007 for an unheard price of $55,575.
Images are property of The Early Years of Motocross Museum, ®2006