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(IMPORTANT)
If the petrol engine is frequently used at high temperatures or under a heavy load, change the oil every 25 hours.
If the engine is frequently used in dusty or other adverse conditions, clean the air filter every 10 hours. If neces-
sary, replace the air filter every 25 hours.
Maintenance should be conducted at the specified intervals (time period or number of hours of use, whichever
is earlier).
If you miss the planned maintenance time, perform the maintenance as soon as possible.
(WARNING)
Stop the engine before starting any maintenance work. Place the engine on a level surface and remove the
spark plug cap to prevent the engine from starting. Do not operate the engine in a poorly ventilated room or
in other closed areas. Ensure that the work area is well-ventilated. The engine exhaust gases contain toxic
carbon monoxide, the inhalation of which can cause shock or loss of consciousness, and even lead to death.
11.1 Inspecting the spark plug
The spark plug is an important engine component that should be checked at regular intervals.
1. Remove the cap and the spark plug cap, and then insert the tool from the outside of the cover through the hole.
2. Insert the handle into the tool and turn it counter-clockwise to replace the spark plug.
3. Check for discolouration and remove carbon deposits. The porcelain insulator around the
central electrode of the spark plug should have a medium to light brown colour.
4. Check the type of spark plug and the gap between the electrodes.
Standard spark plug:
F7RTC
Electrode gap:
0.6 - 0.7 mm (0.024 - 0.028 in)
TIP: The electrode gap should be measured with a feeler gauge and adjusted to the specifications if necessary.
5. Install the spark plug.
Spark plug connector torque: 20.0 N * m (2.0 kgf * m, 14.8 lbf * ft)
TIP: If a torque wrench is not available when installing the spark plug, a good estimate of the correct torque is an
additional 1/4 - 1/2 turn after you achieve a finger-tight fit when screwing in the spark plug. However, the spark
plug should be tightened to the specified torque as soon as possible.
6. Install the spark plug cap and the spark plug cover.
