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1. GENERAL INFORMATION QUANNON 125
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
Clogged float oil passage
Fuel reaches Fuel does not Clogged fuel filter
carburetor reach carburetor Clogged charcoal canister
Clogged auto fuel valve strainer
Faulty auto fuel valve passage
Remove spark plug and Clogged carburetor air balance
install it into spark plug tube
cap to test spark by
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
Valve clearance too small
Normal Low or no Valve stuck open
compression compression 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
Flooded carburetor
Dry spark plug Wet spark plug Throttle valve excessively open
Clogged air cleaner
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