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1. GENERAL INFORMATION ZING125
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
Symptom
Inspection/Adjustment Probable Cause
Check if fuel reaches
carburetor by loosening
drain screw Empty fuel tank
Clogged fuel line between fuel
tank and carburetor
Fuel reaches Fuel does not Clogged float oil passage
carburetor reach carburetor Clogged fuel filter
Clogged charcoal canister
Clogged auto fuel valve strainer
Remove spark plug and Faulty auto fuel valve passage
install it into spark plug Clogged carburetor air balance
cap to test spark by tube
connecting it to engine
ground
Faulty spark plug
Fouled spark plug
Faulty CDI unit
Spark jumps Weak or no spark Faulty pulser coil
Faulty exciter coil
Faulty ignition switch
Broken or shorted ignition coil
wire
Test cylinder
compression
Faulty or slipping clutch
Normal Low or no Valve clearance too small
compression compression Valve stuck open
Worn cylinder and piston rings
Leaking cylinder head gasket
Start engine by follow-
ing normal starting
procedure
Faulty choke control system
Engine does not Engine fires but Leaking intake manifold
fire does not start Incorrect ignition timing
Incorrectly adjusted pilot screw
Remove spark plug and
inspect again
Wet spark plug Flooded carburetor
Dry spark plug Throttle valve excessively open
Clogged air cleaner
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