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clearance decreases the size of the wood chip thus
decreasing the chain's cutting ability.
■ If cutter teeth have hit hard objects such as nails and
stones, or have been abraded by mud or sand on the
wood, have a service agent sharpen the chain.
HOW tO sHaRPEN tHE CUttERs
See figures 24 - 27.
Be careful to file all cutters to the specified angles and to
the same length, as fast cutting can be obtained only when
all cutters are uniform.
■ Tighten the chain tension enough that the chain does
not wobble. Do all of your filing at the mid-point of the
bar. Wear gloves for protection.
■ Use a 5/32 in. diameter round file and holder.
■ Keep the file level with the top plate of the tooth. Do
not let the file dip or rock.
■ Using light but firm pressure, stroke towards the front
corner of the tooth. Lift file away from the steel on each
return stroke.
■ Put a few firm strokes on every tooth. File all left hand
cutters in one direction. Then move to the other side
and file the right hand cutters in the opposite direction.
Occasionally remove filings from the file with a wire
brush.
CaUtION
Dull or improperly sharpened chain can cause
excessive engine speed during cutting which may result
in severe engine damage.
WaRNING
Improper chain sharpening increases the potential of
kickback. Failure to replace or repair damaged chain
can cause serious injury.
CLEaNING tHE EXHaUst PORt aND MUffLER
Depending on the type of fuel used, the type and amount
of lubricant used, and/or your operating conditions,
the exhaust port and muffler may become blocked with
carbon deposits. If you notice a power loss with your petrol
powered tool, a qualified service technician will need to
remove these deposits to restore performance.
CLEaNING aIR fILtER
See figure 28.
A dirty air filter will cause starting difficulty, loss of
performance, and shorten the life span of the engine.
Check the air filter monthly. For best performance, replace
the air filter at least once a year.
■ Loosen the air filter cover by turning the knob
counterclockwise.
■ Remove the air filter.
■ Clean the foam filter element with warm soapy water.
Rinse and let dry.
NOtE:
If the foam filter element is damaged, it should
be replaced.
■ Apply a light coat of engine oil to the foam filter
element, then squeeze it out.
■ Reinstall the air filter.
NOtE:
Make sure the filter is seated properly inside the
cover. Installing the filter incorrectly will allow dirt to enter
the engine, causing rapid engine wear.
■ Reinstall the cover and tighten knob to secure.
CHECKING tHE fUEL CaP
WaRNING
A leaking fuel cap is a fire hazard and must be replaced
immediately.
The fuel cap contains a non-serviceable filter and a
check valve. A clogged fuel filter will cause poor engine
performance. If performance improves when the fuel cap
is loosened, check valve may be faulty or filter clogged.
Replace fuel cap if required.
REPLaCING tHE sPaRK PLUG
See figure 30
This engine uses a Champion RCJ6Y or NGK BPMR7A
spark plug with .025 in. electrode gap. Use an exact
replacement and replace annually.
follow these steps to replace the spark plug.
1. Remove the spark plug boot (item 64).
2. Loosen the spark plug (item 65) by turning it
counterclockwise with a 16 mm socket.
3. Remove the spark plug.
4. Hand thread the new spark plug, turning it clockwise.
NOtE
: A small amount of anti seize compound on the
thread of the new plug will ensure easy removal on the
next service.
5. Tighten with a socket. Do not overtighten.
CaUtION
Be careful not to cross-thread the spark plug. Cross-
threading will seriously damage the engine.
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