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CARBURETOR ADJUSTMENT

Emission Models (with limiter caps)

Level2.

Tools required: Screwdriver,Tachometer(ECHOP/N99051130017).

Parts required: None.

NOTE

Every unit is run at the factory and the carburetor is set in compliance with EPA Phase 1 and California Emission Regulations. In addition, the carburetor is equipped with HI and LO needle adjustment limiters that prevent settings outside acceptable limits.

1.Before adjusting the carburetor, clean or replace the air filter and spark arrester screen.

2.Start engine and run for several minutes to reach operating temperature.

3.Stop engine. Turn HI speed needle (A) CCW (counter clockwise) to stop. Turn LO speed needle (B) midway between full CCW and CW (clockwise) stops.

4.Idle Speed Adjustment.

•Start engine and turn “idle” speed adjustment screw (C) CW until the blades begin to move, then turn the screw CCW until blades stop 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 hesitates, turn LO needle (B) CCW an additional 1/8 turn and repeat acceleration. Continue adjusting until smooth acceleration results.

6.Check HI speed RPM at W.O.T. (Wide Open Throttle). HI speed RPM should be set to specifications found on page 14 "Specifica- tions" of this manual.

7.Check idle speed and reset if necessary. If a tachometer is avail- able, idle speed should be set to the specification found on page 14 "Specifications" of this manual.

WARNING DANGER

When carburetor adjustment is completed, blades should not move at idle, otherwise serious personal injury may result.

SHC-1700, 2100 TYPE 1E

A

B

C

AB

C

SHC-2400HCA-2400

TYPE1ETYPE1E

C

SHC-1700, 2100 TYPE 1E