我校有一台东方红—75型拖拉机,由于起动机功率不足,工作无力,主机很难起动。停置一段时间后,起动机根本起动不着,查其原因,发现小起动机的油路和电路都有问题:一是供油过多,混合气太浓,甚至有大部分汽油呈油粒粘附在进气管壁上,雾化状况甚差,因而点燃不着;二是火花塞的火花太微弱,仅有一点蓝色小火星,不足以点燃混合气体。进一步检查又发现,小起动机火花塞的电极间隙已达到1毫米,比其标准值大了0.3～0.4 My school has a Red Oriental -75 tractor, due to lack of power starter, work weak, difficult to start the host. Stop for a period of time, the starter can not start, check the reason and found a small starter circuit and the circuit has a problem: First, too much oil, the mixture is too thick, and even most of the oil was oil-stick Attached to the inlet pipe wall, very poor atomization, which can not be ignited; second spark spark too weak, only a little blue Mars, not enough to ignite the mixed gas. Further examination also found that small starter spark plug electrode gap has reached 1 mm, 0.3 ~ 0.4 greater than the standard value