16
B
A
Before starting the unit for adjustment, check the following
items:
•
The correct spark plug must be clean and properly
gapped.
•
The air filter element must be clean and properly
installed.
•
The muffler spark arrestor screen and exhaust port
must be clear of carbon.
•
The standard bar and chain combination (see page 4)
must be installed to the power head, and properly
tensioned.
1. Start engine and run for several minutes to reach
operating temperature.
2. Stop engine. Remove grommet cover (A) over “H” and
“L” limiter needles.
3. Turn HI speed needle (H) CCW (counter clockwise) to
stop. Turn LO speed needle (L) CCW (counter clock-
wise) to stop.
4. Idle Speed Adjustment.
• Start engine and turn “idle” speed adjustment screw
(B) CW until the saw chain begins to move, then turn
the screw CCW until saw chain stops moving. Turn
screw CCW an additional 1/4 turn.
5. Accelerate to full throttle for 2-3 seconds to clear
excess fuel from engine then return to idle. Accelerate
to full throttle to check for smooth transition from idle
to full throttle. If engine stops or stalls after full warm
up return the unit to your authorized ECHO dealer for
repair.
6. Install grommet cover (A) over “H” and “L” limiter
needles.
7. Check HI speed RPM at W.O.T. (Wide Open Throttle).
HI speed RPM should be set between 10,500 and
11,500 RPM’s.
8. Check idle speed and reset if necessary. If a tachom-
eter is available, idle speed should be set between
2,700 and 3,300 RPM’s.
CAUTION!
•
When starting, idling adjustment speed should be
adjusted not to rotate the saw chain.
•
When there is trouble with the carburetor, refer to your
distributor or dealer.
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