The engine was advanced for its time, with features normally seen on race bikes: two-cylinder, two-stroke, air-cooled, oil injected, dual rotary valve.

Rotary disc valve induction ensures that all the fuel charge is used and not partly lost (as in a piston ported engine).

The engine's initial air supply begins in an air filter canister below the seat and is drawn through a large plenum chamber just above the transmission and behind the cylinder head, then down into the internal passages leading to the carburetor housing feeding the carburetors.

A7 Avengers participate in the American Historic Racing Motorcycle Association (AHRMA) competition.

[2] Kawasaki Mach III's successfully raced with Ginger Molloy aboard his "Green Meanie" finishing 2nd just behind Giacomo Agostini's MV Agusta during the 1970 500 cc World Championship.