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COMMON PROBLEMS AND CAUSES
Problem Component Cause Solution
Failed engine
Fuel system
No fuel in fuel tank Refuel
Pump blockage or damage: poor fuel quality Clean or replace
Ignition
system
Spark plug failure: excessive carbon deposits, too long-
time usage
Inspect or replace
Spark plug cap failure: Poor contact or burning Inspect or replace
Ignition coil failure: poor contact or burning Inspect or replace
ECU failure: Poor contact or burning Inspect or replace
Trigger coil failure: poor contact or burning Inspect or replace
Stator failure: poor contact or burning Inspect or replace
Wiring failure: poor contact Inspect or adjust
Cylinder
system
Starting mechanism failure: worn or damaged Inspect or replace
Intake and exhaust valves, and valve seats failure: too
much fuel colloidal or too long-time use
Inspect or replace
Cylinder, piston, piston ring failure: too much fuel
colloidal or wear
Inspect or replace
Intake pipe leakage: too long-time use Inspect or replace
Valve timing failure Inspect or replace
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