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1. GENERAL INFORMATION AGILITY 125
TROUBLESHOOTING
ENGINE WILL NOT START OR IS HARD TO START
Inspection/Adjustment Symptom Probable Cause
Check if fuel reaches
carburetor by loosening
drain screw Empty fuel tank
Clogged fuel line between fuel
tank and carburetor
Fuel does not Clogged float oil passage
Fuel reaches Clogged fuel tank cap breather
carburetor reach carburetor hole
Clogged fuel filter
Clogged fuel strainer
Remove spark plug and Faulty auto fuel valve
install it into spark plug
cap to test spark by
connecting it to engine Faulty spark plug
ground Fouled spark plug
Faulty CDI unit
Spark jumps Weak or no spark Faulty pulser coil
Broken or shorted ignition coil
Broken or shorted high-tension
wire
Faulty ignition switch
Test cylinder
compression
Faulty starter clutch
Valve clearance too small
Improper valve and seat contact
Normal Low or no Worn cylinder, piston and piston
compression compression rings
Leaking cylinder head gasket
Seized valve
Improper valve timing
Start engine by follow-
ing normal starting
procedure
Faulty auto bystarter
Engine does not Engine fires but Air leaking through intake pipe
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 Faulty auto bystarter
Throttle valve excessively open
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