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Velocette Valiant
The Velocette Valiant was a British motorcycle produced by Velocette from 1957 to 1963. Launched at the 1956 Earl’s Court Motorcycle Show, the Valiant had a 192 cc (11.7cu in) flat-twin engine but was expensive and criticized for its underpowered engine.〔(【引用サイトリンク】title=Velocette Valiant motorcycle )〕
==Development==
In the mid 1950s Velocette had two very different lines of motorcycles. Alongside the larger and more conventional M and K series, they produced a series of enclosed small capacity four stroke flat twins for the commuter market, at time when most of their competitors were producing two stroke singles.
Launched at the Earls Court Show in November 1956 the ''Velocette Valiant'' was a development of the Velocette LE. It had a two piece cover that enclosed most of the crankcase and gearbox. The engine was based on the LE engine but differed from it considerably, with the engine converted to air cooling for simplicity and lightness. Revised cylinder heads with overhead valves were used, with the compression ratio increased to 8.5:1 from the LE's 7.0:1. A stronger crankshaft with larger bearings was used to handle the increased power, to the LE's . The engine also featured a bigger crankcase and cast iron cylinders with steel pushrod tubes and alloy heads. It was mounted in a duplex frame with a single top tube.
The clutch and four speed gearbox were the same as those fitted to the MK3 LE but the final drive was through a cast aluminium pivoted fork, with a universal joint to the drive shaft. Front suspension was the same as the LE but rear suspension used Woodhead-Monroe springs with hydraulic damping. Two Amal 363 monobloc carburettors fitted to stub inlet manifolds were linked by a balancing tube. The recommended top speed was .〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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