Chapter III Maintenance
- 10 -
3-6 Spark plug
The use of spark plug with incorrect models or
heat values may reduce the engine performance or
damage the engine.
The spark plug and silencer will be overheated
under the continuous operation of the engine. Take care
not to touch the silencer or spark plug.
1) Loosen the unloosening screw ① and remove the left
appearance cover plate ②.
2) Remove the spark plug cap ③, place the sleeve ④
onto a proper position on the spark plug.
3) Insert the driver ⑤ into the sleeve and rotate it along
anti-clockwise direction to remove the spark plug.
4) Check the spark plug.Model of the spark plug:
E7RTC/F7TC
BPR6ES / BP6ES (NGK)
If the machine is required to meet the EMC
certification, only the E6RTC spark plug can be
used.
The spark plug shall be replaced under
circumstances of damaged electrodes and insulators. If it
can be further used, sweep away the impurities
including carbon deposition, etc. accumulated on the
spark plug with wire brush.
5) Measure the clearance of spark plug with thickness
gauge. Adjust the clearance through bending the
side electrodes carefully. The clearance between
electrodes shall be 0.60-0.70 mm.
6) Check the status of gasket of spark plug. Screw in
the spark plug with hands during the installation of
spark plug to prevent incorrect match of screw
threads.
7) After pressing the gasket with spark plug, impact
them tightly with the socket spanner of spark plug.
When installing new spark plug, screw 1/2 circle
more after the gasket is impacted. When
re-installing the used spark plug, screw 1/8-1/4
circle more after the gasket is impacted.
Spark plug torque value: 20.0 N*m (2.0 kgf*m,
14.8 lbf*ft)
The spark plug must be securely
fastened, or the engine may be damaged.
Please use the recommended or
equivalent spark plug.Spark plug of improper heat
values shall be prohibited.
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