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A. Oil adheres on the surface of spark plug and covers the electrode. Skilled drivers step on the accelerator slightly during starting to protect against "oil
suffocation".
B. Carbonation. The cause is oil burning not fully.
C. Gap between electrodes is too big. It causes no sparkling.
D. The insulator of spark plug broke.
Removing troubles:
A. To regulate gap between electrodes properly to meet requirement.
B. Cleaning. To steep the spark plugs in kerosene or acetone a little while to remove oil and (or) carbon by brush.
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