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J.A. Prestwich Motorcycles

JAP 1922 550cc Sidevalve Engine

JAP-1922-550cc-SV-Single.jpg
The 550 c.c. J.A.P. single cylinder. Note the die-cast "fir cone" valve cap. radiators, the new position of the sparking plug, and the oil spray for the valve sterns.

Credit: The MotorCycle