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Clean the spark plug by compressed air, thus to guarantee that no shatter is exist in the firebox.
Remove the spark plug by special spanner or other tools.
（1）Inspection:
Carry out the following inspection, and make replacement when necessary:
．whether the insulator is damaged
．whether the electrode is worn
．Burning condition and color
— Light grey indicates a good burning condition.
— Paleness indicates any error in ignition system, or any diluted air mixture.
—Humidity or black indicates carbon distribution or over rich air mixture.
Visual inspection of spark plug
Replace the spark plug if and crack or wearing is detected.
The following spark plug is recommended:
Standard C5HSA(NGK)
Heat Type C6HSA(NGK)
Cold Type C7HSA(NGK)
（2）Reuse of spark plug:
Clean the electrode of spark plug by scratch brush or special tools.
Check the distance between the central electrode and lateral electrode of spark plug by steel feeler gauge.
If necessary, carefully bend the lateral electrode to adjust the distance.
Distance of spark plugs：0.60～0.70mm
Installed the spark plug onto the cylinder, and fix it to specified torque.
Torque: 18 N·m
Note: Fix the spark plug by hand, and then by special spanner, thus to protect the cylinder cover.
（3）Replacement of spark plug
Adjust the spark plug distance by steel feeler gauge, until it meets the specified value.
Note: Do not fix the spark plug too light.
Install the new spark and sealing cushion, and fix them by
hand.
After contact the spark plug hole, continue fixing by 1/2
circle.
Battery
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