该分层扫气系统由曲轴箱、主扫气道、副扫气道、分层管、笛簧阀和化油器等组成。

The scavenging system is composed of crankcase, main scavenging passage, sub passage stratifying pipe, reed valve and carburettor.

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原理：常闭型直动式电磁阀通电时，电磁线圈产生电磁吸力把阀芯提起，使关闭件离远开阀座密封副打开；

Principle: when the power is on, the electromagnetic force of the electromagnetic force to shut off the valve seat, the valve open;

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