HER CHEE ATV-320 S Service Manual page 60

Chapter 2 Fuel System & Carburetion
Troubleshooting
Engine cranks but won't start
◦ No fuel in tank
◦ No fuel to carburetor
◦ Engine flooded with fuel
◦ No spark at plug (faulty ignition system)
◦ Clogged air cleaner
◦ Intake air leak
◦ Improper choke operation
◦ Improper throttle operation
◦ Faulty fuel valve
Hard starting or stalling after
starting
◦ Improper choke operation
◦ Ignition malfunction
◦ Faulty carburetor
◦ Contaminated fuel
◦ Intake air leak
◦ Incorrect idle speed
◦ Faulty fuel valve
Rough idle
◦ Faulty ignition system
◦ Incorrect idle speed
◦ Faulty carburetor
◦ Contaminated fuel
Misfiring during acceleration
◦ Faulty ignition system
Backfiring
◦ Faulty ignition system
◦ Faulty carburetor
Poor performance and fuel
economy
◦ Clogged fuel system
◦ Faulty ignition system
◦ Faulty fuel valve
◦ Faulty components in the evaporative
emission control system (US version only)
Lean mixture
◦ Clogged fuel jet
◦ Stuck vacuum piston
◦ Faulty float valve
◦ Low float level
◦ Blocked fuel cap vent
◦ clogged fuel line
◦ Restricted fuel line
◦ Clogged air vent tube
◦ Intake air leak
◦ Faulty fuel valve
Rich mixture
◦ Clogged air jets
◦ Faulty float valve
◦ Float level too high
◦ Improper choke operation
◦ Dirty air cleaner
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