22
CARBURETOR
ADJUSTMENT
Type 1 Non-Emission Models
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 cutting attachment stops turning. Turn screw out, CCW an
additional 1/4 turn.
WARNING
DANGER
Blade 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 needles out CCW
PE-2000 LO (B) 1-3/8 turns; HI (A) 1-7/8 turns
PE-2400 LO (B) 2-1/2 turns; HI (A) 2-1/4 turns
PE-3100 LO (B) 1-1/8 turns; HI (A) 1-1/8 turns
Fine Tuning
(Requires Accurate Tachometer)
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 (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)
3.
HI speed adjustment.
Adjust HI (A) needle with tachometer. Refer to Wide Open Throttle RPM
settings listed in "Specifications" on page 10.
4.
Check idle speed and reset if necessary. If tachometer is available, idle
speed should be set to the specifications found on page 10 "Specifications"
of this manual.
WARNING
DANGER
When carburetor adjustment is completed, the blade should not
turn at idle, otherwise serious personal injury may result.
C
B
A
C
B
A
PE-2000
PE-2400
PE-3100
