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Yamaha TD2 is an air-cooled road racing motorcycle made by Yamaha produced between 1969 and 1970. The equivalent 350cc version was called TR2 == Development == The TD1 bikes had a significant impact on British 250cc class racing in the middle-1960s〔''Motor Cycle'', 24 November 1966. p.710, 711. 'Racers you can buy' () "''Only production two-fifty racing twin at present available is this sleek TD1B Yamaha''" "''...many private owners rate it the fastest thing in its class''" Accessed 2013-08-21〕 which was historically contested by single-cylinder engines, some with ageing designs.〔() Mick Walker. Retrieved 2013-03-04〕 Some TD1s were overbored to 251cc, thus being eligible for the 350cc class Building on the TD1 successes, the arrival of TD2 together with the TR2 350cc version which could be overbored to around 352cc, making it eligible for the 500cc class, announced the 'death knell' of the traditional 350cc and 500cc class single-cylinder four stroke engines manufactured to 1950s designs The new over-the-counter Yamahas were smaller, lighter with greater manoeuvreability and consequently easier braking. The engines were simpler to build - but not significantly easier to maintain as four-stroke singles potentially lasted an entire season - offering a small compact unit without the height associated with overhead valves and camshafts Rod Gould's appearance on the European racing scene with TD2 and TR2 machines (and Buco helmets) secured after a business trip to US was a major factor in the change to two-stroke domination. Gould learned his craft initially by campaigning ageing (1950s design) Manx Nortons around the UK short circuits, with 1960s Bultacos and Aermacchis for the smaller classes.〔''Motorcycle Mechanics'', August 1966, 'Full Chat'. Retrieved 2013-03-22〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Yamaha TD2」の詳細全文を読む スポンサード リンク
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