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・ Make sure the unit is cool before maintain the unit.
SPARK PLUG
The spark plug should be removed from the engine and
checked after each 25 hours of operation. The tips can
be cleaned with a stiff brush.
Adjust the gap to 0.6-0.7mm (see sketch). Replace the
spark plug if it is oil fouled or damaged, the average
spark plug life is approximately 100 hours.
CAUTION-Do not over tighten the spark plug. The cor-
rect torque is 10.7-16.6N • m(100 -160 kgf • cm).
CYLINDER COOLING FINS
1. Loosen the knob and remove the air fi lter cover.
2. Twist the plug cap on the spark plug back and forth a
couple of times to loosen the boot, then pull the boot
off of the spark plug.
3. Loosen the knob and lift off the top cover. Clean all
dirt and debris from the cooling fi ns and from around
the cylinder base. Reinstall the top cover and the air
fi lter cover.
EXHAUST MUFFLER
• The exhaust muffl er should be inspected and cleaned
after every 100 hours of use.
1. Remove the air fi lter cover.
2. Remove the plug cap.
3. Loosen the knob and lift off the top cover.
4. Remove and clean the screws, the tail and gasket
with a safety solvent and a stiff brush. If any part
cannot be thoroughly cleaned, it must be replaced.
5. Reinstall the gasket and tail onto the muffl er, then
reinstall and tighten the two screws.
6. Reinstall the top cover and the air fi lter cover.
CAUTION
Top Cover
Plug Cap
Air Filter Cover
＿ US-9 ＿
0.6-0.7mm
Knob
Cooling
Fin
Gasket
Tail
Screw
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