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X7503274701
© 8/2015 ECHO Inc.
TROUBLESHOOTING
340S
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 cranks -
starts hard/
doesn’t start
Fuel at carburetor
No fuel at carburetor
•Fuel strainer clogged
•Fuel line clogged
•Carburetor
•Clean or replace
•Clean or replace
•See your SHINDAIWA
dealer
Fuel at cylinder
No fuel at cylinder
Carburetor
See your SHINDAIWA
dealer
Muffler wet with fuel
Fuel Mixture too rich
•Open choke
•Clean/replace air filter
•Adjust carburetor
•See your SHINDAIWA
dealer
Spark at end of
plug wire
No spark
•Stop switch OFF
•Electrical problem
•Interlock switch
•Turn switch to ON
•See your SHINDAIWA
dealer
•See your SHINDAIWA
dealer
Spark at plug
No spark
•Spark gap incorrect
•Covered with carbon
•Fouled with fuel
•Plug defective
•Adjust to .65mm (0.026 in.)
•Clean or replace
•Clean or replace
•Replace plug
Engine runs,
but dies or
does not
accelerate
properly
Air filter
Air filter dirty
Normal wear
Clean or replace
Fuel filter
Fuel filter dirty
Contaminants/residues
in fuel
Replace
Fuel vent
Fuel vent plugged
Contaminants/residues
in fuel
Clean or replace
Spark Plug
Plug dirty/worn
Normal wear
Clean and adjust or replace
Carburetor
Improper adjustment
Vibration
Adjust
Cooling System
Cooling system
dirty/plugged
Extended operation in
dirty/dusty locations
Clean
Spark Arrestor
Screen
Spark arrestor screen
plugged
Normal wear
Replace
Engine does
not crank
N/A
N/A
Internal engine problem
See your SHINDAIWA
dealer
