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24
CARBURETOR ADJUSTMENT
Non Emission Models (without limiter caps)
Level 2.
Tools required: Screwdriver, Tachometer (ECHO P/N 99051130017).
NOTE
If carburetor has limiter caps follow "Carburetor Adjustment" procedures for Type 1E models on previous page.
Idle Speed Adjustment
Turn "idle" speed adjustment screw (C) CW (clockwise) until cutting attachment begins to turn, then turn screw out CCW (counter clock- wise) until attachment stops turning. Turn screw out, CCW an additional 1/4 turn.
WARNING DANGER
Cutting attachment must not turn 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 LO needle (B) out, CCW
Fine Tuning
(Requires Accurate Tachometer ECHO P/N 99051130017)
1.Start engine and allow to warm to operating temperature (minimum 2 - 3 minutes) varying engine speed from idle to full throttle.
2.Always begin fine tuning with LO needle.
a.Lean
b.Rich
c.Final setting - Set needle at mid point between lean rich drop- off points. (3)
d.Turn 1/8 turn CCW (out) making mixture slightly richer. (4)
3.High speed adjustment.
Adjust HI needle (A) with tachometer to achieve the specifications found on page 12 "Specifications" of this manual.
4.Check idle speed and reset if necessary. Using a tachometer, idle speed should be set to the specification found on page 12 "Specifi- cations" of this manual.
WARNING DANGER
When carburetor adjustment is completed, the cutting attachment should not turn at idle, otherwise serious personal injury may result.