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Spark plug
The spark plug condition is influenced by:
•
An incorrect carburetor setting.
•
Wrong fuel mixture (too much oil in the gasoline).
•
A dirty air filter.
These factors cause deposits on the spark plug
electrodes, which may result in malfunction and starting
difficulties. If the engine is low on power, difficult to start
or runs poorly at idling speed, always check the spark
plug first.
If the spark plug is dirty, clean it and check the
electrode gap. Readjust if necessary. The correct
electrode gap(A) is 0.5 mm (0.02inch).
A
The spark plug should be replaced after about a month
in operation or earlier if the electrodes are badly
eroded.
1. Remove spark plug and check for fouling, worn and
rounded center electrode.
2. Clean the plug or replace with a new one. Do not
clean it with sand blast. Remaining sand will
damage the engine.
3. According to Technical Specification, adjust spark
plug gap by bending outer electrode.
4. Reinstall the spark plug, tighten it securely with a
socket wrench.
NOTICE
Always use the recommended spark plug type. An
incorrect spark plug can severely damage the piston/
cylinder.
Muffler
The muffler is designed in order to reduce the noise
level and to direct the exhaust gases away from the
operator. The exhaust gases are hot and can contain
sparks, which may cause fire if directed against dry and
combustible material.
Some mufflers (A) are equipped with a spark arrester
mesh (B). If your chain saw has this type of muffler, you
should clean the mesh at least once a week. This is
done with a wire brush.
A
B
NOTICE
The mesh must be replaced, if damaged. The saw will
be overheated, if the screen is clogged. This results in
damage on the cylinder and the piston. Never use a
saw with a clogged or defective muffler.
Adjusting the oil pump
The oil pump can be adjusted to give four (4) different
oil flow rates.
To adjust the flow rate, first remove the chain, bar,
clutch cover, centrifugal clutch and the clutch drum.
Using a screwdriver, adjust the oil flow rate by turning
the adjuster screw one way or the other. The projection
on the screw should point towards the chosen setting.
The diagram shows the setting for flow rate 2.
Recommended settings:
16"
bars:
Setting
2
18" bars and longer:
Setting 3~4
WARNING
Do not carry out this adjustment with the engine
running!
Needle bearing maintenance
The clutch drum is equipped with one of the following
chain sprockets:
•
Type A: Spur sprocket, the chain sprocket is welded
on the drum).
Summary of Contents for NT3760
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