The Kawasaki W series is a line of motorcycles made by Kawasaki since 1965 that shares some characteristics of classic British vertical-twin standard motorcycles. Sold as a 1966 model in the North American market, the first Kawasaki W1 had the largest engine displacement of any model manufactured in Japan at the time. Kawasaki continued to build models of the W brand similar to the W1 which will go out of production, ending with a "final edition".