PB-755S H/T
TROUBLESHOOTING
X7531125705
37
© 11/19 ECHO Incorporated
Level 2.
Note: Every unit is run at the factory and the carburetor is set in
compliance with emission regulations. Carburetor
adjustments, other than idle speed, must be performed by an
authorized ECHO dealer.
Before adjustment make sure that:
• Air filter is clean and properly installed.
• Spark arrestor screen and muffler are free of carbon.
• Blower pipes are installed.
1.
Start engine, run at idle for one
minute.
2.
Complete warm up by running at full
throttle for 5 minutes, operating
choke twice to clear air from
carburetor chambers.
3.
Check idle speed and reset if
necessary. If a tachometer is
available, idle speed screw (A)
should be set to the specifications
found on “Specifications” Page of this manual. Turn idle screw (A)
clockwise to increase idle speed; counter clockwise to decrease idle
speed.
TROUBLESHOOTING
Fuel vapors are extremely flammable and may cause fire and/or
explosion. Never test for ignition spark by grounding spark plug
near cylinder plug hole, otherwise serious personal injury may
result.
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem
Check
Status
Cause
Remedy
Engine
starts
hard
or Engine
does not
start
Fuel at
carburetor
No fuel at
carburetor
Fuel strainer or
fuel line
obstructed
Clean or replace
See your dealer
A
