对于一定马力的发动机来说，单气缸发动机需要较大的飞轮来保持其瞬时速度的变化。
For an engine of a given horsepower, single cylinder engines require large flywheels to keep the momentary speed variations.
单件气缸和曲轴箱总成发动机提供卓越的刚性，重量轻。
One-piece cylinder and crankcase assembly provides superior engine rigidity and light weight.
从1958年起，便已使用带有单顶置凸轮机的发动机。
Since 1958, an engine with a single overhead camshaft has been used.
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