8. Replace Spark Plug
This engine uses a Torch BM6A with 0.6-0.7 mm electrode gaps
(Or NGK: BM6A, BMR6A, BPMR6A).
The spark plug should be replaced each year to ensure the
engine starts easier and runs better.
1. Loosen 3 screws on cylinder cover (Pic.30).
2. Remove the cylinder cover.
3. Pull off the spark plug boot (Pic. 31).
4. Remove spark plug from cylinder and discard.
5. Replace with a new spark plug and tighten securely with a
3/4 inch socket wrench. Spark plug gap should be 0.025 inch
(0.6 mm).
6. Reinstall the spark plug boot.
7. Reinstall the cylinder cover and 3 screws. Tighten securely.
9. Replace Fuel Filter
To replace fuel filter, drain your unit by running it dry of fuel.
Remove fuel cap and its connected retainer from tank. Pull filter
from tank and remove from line. Replace and reassemble.
10. Chain Adjustment
See CHAIN TENSION on page 14.
11. Carburettor Adjustment (Pic. 32)
WARNING: The chain will be moving during most of
this procedure. Wear your protective equipment and
observe all safety precautions. The chain must not move
at idle speed.
The carburettor has been carefully set at the factory.
Adjustments may be necessary if you notice any of the following
conditions:
• Chain moves at idle. See IDLE SPEED-T adjusting procedure.
• Saw will not idle. See IDLE SPEED-T adjusting procedure.
Idle Speed--T
Allow engine to idle. If the chain moves, idle is too fast. If the
engine stalls, idle is too slow. Adjust speed until engine runs
without chain movement (idle too fast) or stalling (idle too slow).
The idle speed screw is located in the area above the primer
bulb and is labelled T.
• Turn idle screw (T) clockwise to increase engine speed.
• Turn idle screw (T) counterclockwise to decrease engine
speed.
The carburettor is factory set and should not require adjusting.
The carburettor will permit only limited adjustment of the ”L”
(Low Jet) and “H” (High Jet) needles. Any adjustment should be
done by an authorised service centre.
PIC. 30
PIC. 32
PIC. 31
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