Candle working properly
The underside of the insulator is white-gray, even to light brown shades. Slight powdery coating on the bottom of the insulator and on the electrodes, which can be easily removed or brushed.
From the inside, the body is light gray or covered with sediment in color from yellowish to dark brown.
Conclusion: Engine condition is good. Correct spark plug size.
Dirty candle
The lower part of the insulator, the electrodes and the body of the candle are covered with sediment in the form of a large, dark gray silky powder.
Cause: A very rich mixture. Incorrect installation of the carburetor, start-up equipment does not function well, a very long ride on suction. The thermal value of the spark plug is very high. Driving on very short sections of the track.
Conclusion:Install the carburetor correctly. Check the engine If necessary, use spark plugs of a smaller thermal value
Oiled candle
The lower part of the insulator, the electrodes and the body of the spark plug are coated with oily, shiny soot.
Cause: Lots of oil in the combustion chamber. Worn piston rings, cylinders and valve guides.
Conclusion: Repair the engine. Install new spark plugs.
Candle overheated
The center electrode is slightly melted, bubbly, spongy, softened top of the lower part of the insulator. The color of the lower part of the insulator is mainly pale gray, on the top there are growths and small pearls (slightly melted).
Cause: The thermal value is very small. The candle is not pressed. Glow plugs are the result of oil sludge.
Conclusion: Install spark plugs with normal heat value.
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