The 1962 Honda RC171 replaced the RC170 by using a new engine, with bore and stroke of 49 x 45 mm, giving a total capacity of 339.4 cc, used for the first time at the Ulster GP. Power output is 56 bhp at 12,500 rpm. Since there are some cooling problems, the bike gets an oil cooler behind the exhaust down pipes. Later, after some small changes, the engine is thermically OK, and the oil coolers are taken off again.
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