Echo PB-620H User Manual

Page 21

ower

lower

Perator

anual

Initial Adjustment

1. With engine off, turn HI speed screw (C) counterclockwise to

stop.

2. Turn LO speed screw (B) midway between stops.

3. Turn idle screw (A) until tip of screw just touches throttle plate;

then turn three (3) turns clockwise.

Final Adjustment

IMPORTANT

Limiter caps prevent exceeding C.A.R.B. and E.P.A. emission lim-

its and over-rich adjustment, but not over lean adjustment, which

can cause engine failure: Do not exceed recommended HI speed

engine R.P.M. during operation, or for long periods during adjust-

ment.

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 carburetor chambers.

3. Run at idle and accelerate to check for smooth transition from idle

to high speed; if engine hesitates, turn LO speed screw (B) coun-

terclockwise 1/8th of a turn at a time until acceleration is smooth.

4. Use a tachometer to adjust idle speed to specifications found on

page 24.