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LOW ALTITUDE ADJUSTMENT
Engines that have been adjusted to operate at high altitudes 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.
3. Start engine and turn the high-speed needle (A) rich (CCW) until
the engine runs between 13,500 and 14,500 RPM. Then turn the
low-speed needle (B) rich (CCW) until the engine does not
hesitate when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Turn “idle” speed adjustment screw (C) 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 adjustment.
A
B
C
LO HI
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.
3. Start engine and turn the HI speed needle (A) lean (CW) until the
engine runs between 13,500 and 14,500 RPM. Then turn the LO
speed needle lean (B) (CW) until the engine does not hesitate
when accelerated.
DO NOT REMOVE LIMITER CAPS!
4. Idle Speed Adjustment.
• Turn “idle” speed adjustment screw (C) 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 adjustment.