（1）Clean off carbon deposits on the spark plug electrode using
a plug cleaner or wire brush.
（2）Check electrode gap. The gap should be 0.6mm to 0.7mm. Adjust
the gap, if necessary, by carefully bending the side electrode.
Recommended Spark Plug: CR5HSB (NGK)
NOTICE！An incorrect spark plug can cause engine damage.
For good performance, the spark plug must be properly gapped and free
of deposits.
1、Disconnect the spark plug cap, and remove any dirt from around the
spark plug area.
2、Remove the spark plug with a 5/8-inch spark plug wrench.
DANGE！Be careful not to touch the muffler while it is hot.
3、Inspect the spark plug. Replace it if damaged or badly fouled, if the
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