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MAINTENANCE
Engine Break-In
New engines must be operated a minimum duration of two tanks of fuel
break-in before carburetor adjustments can be made. During the break-in
period your engine performance will increase and exhaust emissions will
stabilize. Idle speed can be adjusted as required.
High Altitude Operation
This engine has been factory adjusted to maintain satisfactory starting and
durability performance up to 335m (1,100 ft.) above sea level (ASL) (96.0
kPa). To maintain proper engine operation above 335m (1,100 ft.) ASL the
carburetor may need to be adjusted by an authorized service dealer.
If the engine is adjusted for operation above 335 m (1,100 ft.) ASL,
the carburetor must be re-adjusted when operating the engine below
335 m (1,100 ft.) ASL, otherwise severe engine damage may result.
1.
Before adjusting carburetor clean or replace air filter and muffler "Spark
Arrester Screen".
2.
Make sure the 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" High Speed needle counterclockwise (CCW) to
stop. Turn "L" Low Speed needle midway between full clockwise (CW)
stop and CCW stop.
5.
Idle Speed Adjustment:
• Start engine, turn Idle Speed Adjustment Screw "T" CW until the saw
chain begins to move, then turn screw out CCW until the saw chain
stops moving. Turn screw out, CCW, an additional 1/4 turn.
When carburetor adjustment is completed, the saw chain
should not move at idle, otherwise serious personal injury may
result.
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 to value listed on
technical data page.
52
CS-4920
X7503352100
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