Echo CS-3510 Operator's Manual page 54

TROUBLESHOOTING
ENGINE PROBLEM TROUBLESHOOTING CHART
Problem Check
Engine
does not
crank
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.
54
Status
Internal engine
N/A
problem
Cause
See your dealer
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CS-3510
Remedy
X7503360201