.27.
① Take apart the wing nut and air filter housing and take out the filter element.
② Use an uninflammable or high-burning-point detergent to clean filter element and let it dry up.
③ Drench filter element with engine oil and then squeeze the oil out.
④ Refit filter element and air filter housing.
3. Maintenance of spark plug
Note! Never use any spark plug with an incorrect heat range. In order to guarantee normal running of the
engine, the spark plug shall have an appropriate gap without deposit on it.
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