The overhead camshaft (OHC) and combination valve spring structure are in common use in modern motorcycle gasoline engine.
近代摩托车用汽油机普遍采用顶置凸轮轴结构（OHC）和组合式气门弹簧。
The overhead camshaft (OHC) and combination valve spring structure are in common use in modern motorcycle gasoline engine.
近代摩托车用汽油机普遍采用顶置凸轮轴结构（OHC）和组合式气门弹簧。
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