Chapter 2
Periodic maintenance
Section 2 Maintenance and adjustment
2
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5
Clean Every 4000 KM（20 Months）
Replace every 8000 KM（40 Months）
It can lead to difficult starting and poor engine
performance with ignoring spark maintenance. If the spark
plug is used for a long time, the electrode will gradually
ablate and cause carbon deposits inside. According to the
regular maintenance table, the spark plug should be
inspected, cleaned and reset the gap according to the
recommended period.
Remove the spark plug cap and remove the spark plug
as in Fig.2.2.6.
Carbon deposits on the spark plug will hinder the
good sparks and may cause carbon connections to cause
misfire. The carbon deposits must be removed regularly.
If the central electrode is worn severely, the spark plug
should be replaced, and the spark plug clearance should be
calibrated to the specified clearance with a feeler gauge.
Spark plug clearance：0.6—0.7mm
As in Fig.2.2.7.
Check whether the spark plug is burned out. If it
founds to be abnormal, the spark plug can be replaced
according to the following table.
It can tighten the spark plug to the
specified tightening torque with using a
spark plug socket wrench.
Spark plug：18N.m（1.8kg.m）
Fig 2.2.6
FIG 2.2.7
If the standard type spark plug tends to be black when it
is wet, it can be replaced with this type of spark plug.
Standard type. The normal spark plug is light
gray and cotton yellow.
If the standard spark plug is easily overheated and in
white, it can be replaced with this type of spark plug.
Note：
When replacing the spark plug, it needs to confirm
the thread size and the rod length L. If the rod is too
short, it will cause carbon deposits on the threaded
part of the plug hole; if the plug rod is too long, it
will damage the engine.
Note：
Before using the spark plug tightening wrench, it
should tighten the spark plug into the threaded hole
of the cylinder hole in order to avoid damage.
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