The G15/45 was the final edition of the Matchless vertical twin. Basically it was the G12 650cc motor bored out to the maximum possible and advertised as a “45” as in cubic inches for the North American market. The motor was somewhat fragile and overstressed, so with only 200 machines built it was replaced by the Norton750cc Atlas power unit in later versions of the G15.#matchlessmotorcycle #g15 #1962 #britishmotorcycle #barbermuseum #barbercollection | Barber Vintage Motorsports Museum