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When a light gray or reddish brown, you take it easy because it means the engine is in good condition that fit the condition of the engine, ignition timing and engine settings.

When the end of the insulator, electrodes and spark plugs covered with black soot and combustion smooth and dry, you should immediately check the choke mechanism, the air filter and replace spark plugs if necessary. The possibility exists that does not fit with the spare parts. If ignored it will be wasteful fuel consumption, black smoke and difficult to start when engine cold.

Color slightly yellow edge insulation may appear light brown and green color usually indicates the possibility of gasoline or oil contaminated water or additives are less suitable. As a result, sluggish engine, slowly accelerates, breathing hard and explosive exhaust.

So be more frequent cleaning and caring for spark plugs. Since the spark plugs will support machine-groomed to work well. Clean the spark plug every 2500 km and have it replaced when it has covered 20 000 km

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lina  Jul 24 automotive world