Use and Care Manual
23
B
A
BEFORE MAKING ADJUSTMENTS:
• The correct spark plug must be clean and properly
gapped.
• The air lter element must be clean and properly
installed.
• The mufer spark arrestor screen and exhaust port
must be clear of carbon.
• The standard bar and chain combination must be
installed to the power head, and properly tensioned.
LOW ALTITUDE ADJUSTMENT
Engines that have been adjusted to operate at high alti-
tudes must be readjusted to operate properly at altitudes
below 2000 feet.
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. Start engine and turn the high-speed needle rich
(CCW) until the engine runs between 11,500 and
12,000 RPM. Then turn the low-speed needle rich
(CCW) until the engine does not hesitate when ac-
celerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• 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 ex-
cess 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 adjustment.
6. Install grommet cover (A) over “H” and “L” limiter
needles.
HIGH ALTITUDE ADJUSTMENT
High altitude adjustment may be required for proper
operation of this engine above 2000 feet.
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. Start engine and turn the HI speed needle lean (CW)
until the engine runs between 11,500 and 12,000
RPM. Then turn the LO speed needle lean (CW)
until the engine does not hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• 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.
WARNING
Cutting attachment must not move when unit is
idling.
5. Accelerate to full throttle for 2-3 seconds to clear ex-
cess 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 adjustment.
6. Install grommet cover (A) over “H” and “L” limiter
needles.