CARBURETOR ADJUSTMENTEngine 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.

BEFOREMAKINGADJUSTMENTS:

•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.

LOWALTITUDEADJUSTMENT

Engines that have been adjusted to operate at high altitudes must be readjusted to operate properly at altitudes below 2000 feet.

A

B

1.Start engine and run for several minutes to reach operat- ing 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 10,000 and 12,000 RPM. Then turn the low-speed needle rich (CCW) until the engine does not hesitate when accelerated.

DO NOT REMOVE LIMITER CAPS!

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 adjustment.

6.Install grommet cover (A) over “H” and “L” limiter needles.

HIGHALTITUDEADJUSTMENT

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 operat- ing 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 10,000 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.

•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 adjustment.

6.Install grommet cover (A) over “H” and “L” limiter needles.

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