page_title: Matchless G12
section_title: Matchless G12
hierarchical_section_title: Matchless G12 / Development / Matchless G12
caption_attribution_description: English: Twin-cylinder Matchless G12 motorcycle in Felixstowe, Suffolk. The registration mark was issued by Hertfordshire County Council in 1960.
context_page_description: The Matchless G12 is a British motorcycle made by Associated Motorcycles at the former Matchless works in Plumstead, London. Developed in 1958 specifically to capture the potentially lucrative US market, the last G12 was produced in 1966.
context_section_description: The Matchless G12 was one of the last motorcycles under the Matchless name and was also produced as the AJS Model 31 by the same company. Designer by Phil Walker, AMC knew that it had to be a 650 cc (39.7 cu in) but wanted to use as many parts from the Model 11 as possible. The cylinders could not be bored out further so the stroke was lengthened from 72.8 to 79.3 mm (2.87 to 3.12 in), resulting in a capacity of 646 cc (39.4 cu in). This meant developing a new crankshaft and primary chaincase, which also provided the opportunity to add a Lucas alternator. Volume production began in September 1958.
caption: 1960 Matchless G12 in use
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