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17
Idle adjusting screw
High speed needle (H)
Low speed needle (L)
MAINTENANCE AND CARE
CARBURETTOR ADJUSTMENT
Every unit is run at the factory and the carburettor
is set in compliance with California Emission
Regulations. In addition, the carburettor is equipped
with “H” (High Speed Needle) and “L” (Low Speed
Needle) needle adjustment limited that prevent
settings outside acceptable limits.
1. Before adjusting carburettor clean or replace air
filter and muffler, “Spark Arrestor Screen”.
2. Make sure the cutting attachments such as bar
and chain are properly adjusted.
3. Start engine and run several minutes to bring to
operating temperature. Flash choke twice during
warm-up to clear any air from the fuel system.
4. Stop engine.
Turn “H” speed needle CCW to stop.
Turn “L” speed needle midway between full CW
stop and CCW stop.
5. Idle Speed Adjustment:
• Start engine, turn “Idle” speed adjustment
screw CW (clockwise) until the saw chain
begins to turn, then turn screw out CCW
(counter clockwise) until the saw chain stops
turning.
Turn screw out, CCW, an additional 1/4 turn.
6. Accelerate to full throttle for 2 - 3 seconds to
clear any excess fuel in the engine, then return to
idle.
Accelerate engine to full throttle to check for
smooth transition from idle to high speed.
If engine hesitates turn “L” needle CCW 1/8 turn
and repeat acceleration.
Continue adjustment until smooth acceleration
results.
7. Check idle speed and reset if necessary as
described in item 5. If a tachometer is available
idle speed should be set as specified in the
Instruction Manual.
WARNING DANGER
CUTTING ATTACHMENT MUST NOT TURN OR
MOVE WHEN UNIT IS IDLING.
CAUTION
When starting, idling adjustment speed should be
adjusted not to rotate the saw chain.
Correct idle speed is adjusted 2,900 to 3,100
r/min.
Or 1/4 turn counter clockwise from the point the
chain stops moving.
When there is some trouble with the carburettor,
refer to your distributor or dealer.