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CARBURETOR ADJUSTMENT

Non Emissions Models

Level 2

Tools required: Screwdriverwith2mmbladewidth,Tachometer(ECHOP/N99051130017)

Parts Required: None

NOTE

If carburetor has limiter caps follow "Carburetor Adjustment" procedures for Emission models on previous page.

Idle Speed Adjustment

Turn "idle" speed adjustment screw (C) CW (clockwise) until blades begin to move, then turn screw out CCW (counter clockwise) until blades stop moving. Turn screw out, CCW an additional 1/4 turn.

WARNING DANGER

Blades must not move when unit is idling, otherwise serious personal injury may result.

Basic Setting

1.Stop engine and turn both LO (B) and HI (A) needles in, CW until they stop and are lightly seated.

IMPORTANT

DO NOT over tighten needles. Forcing them to tighten will damage the carburetor.

2.Turn needles out CCW:

HC-1500 LO (B) 1-1/4 turns; HI (A) 1-1/2 turns Others (LO) (B) 1-1/4 turns; HI (A) 1-3/8 turns

Fine Tuning

(Requires Accurate Tachometer)

1.Start engine and allow to warm to operating temperature (minimum 2 - 3 minutes) while varying engine speed from idle to full throttle.

2.Always begin fine tuning with LO (B) needle.

a.Lean drop-off - With engine idling, turn LO (B) needle slowly CW (in) to lean drop-off point. RPM will increase, then abruptly drop-off. Note this position. (1)

b.Rich drop-off - With engine idling, slowly turn LO (B) needle CCW (out) to rich drop-off point. RPM will increase then gradually slow and drop-off. Note this position. (2)

c.Final setting - Set needle at mid point between lean rich drop- off points. (3)

d.Turn needle 1/8 turn CCW (out) making mixture slightly richer.(4)

AB

C