Echo PB-2155 Operator's Manual page 19

Adjusters
Idle Speed Adjuster (T)
Low Speed Mixture Adjuster (L)
High Speed Mixture Adjuster (H) Controls amount of fuel at full
Before Adjustment
Check that:
- Air filter is clean and properly installed.
- Spark arrestor screen and exhaust port are free of carbon
- Blower pipes are installed
Initial Adjustment
1. With engine off, turn H adjuster anticlockwise to stop.
2. Turn L adjuster midway between stops.
3. Turn T adjuster until tip of adjuster just touches throttle plate;
then turn three turns clockwise.
Final Adjustment
IMPORTANT
Limiter caps prevent exceeding emission limits and over rich
adjustment, but not over lean adjustment, which can cause en-
gine failure: Do not exceed recommended high speed engine rev
during operation, or for long periods during adjustment.
1. Start engine, run at idle for one minute.
2. Complete warm up by running at full throttle for 5 minutes, oper-
ating choke twice to clear air from carburettor chambers.
3. Run at idle and accelerate to check for smooth transition from idle
to high speed; if engine hesitates, turn L adjuster anticlockwise
1/8 turn at a time until acceleration is smooth.
4. Adjust T adjuster to 2,700 r/min, using tachometer.
NOTE
When there is some trouble with the carburettor, contact your dis-
tributor or dealer.
Control throttle opening at idle.
Controls amount of fuel at low
speed and supplementary fuel for
smooth progression from idle to
high speed.
throttle
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