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1. GENERAL INFORMATION ATV 50
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
Fuel reaches Fuel does not Clogged float valve
carburetor reach carburetor Clogged charcoal canister
Clogged fuel filter
Faulty auto fuel valve
Remove spark plug and
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 A.C. generator
Broken or shorted ignition coil
Broken or shorted exciter coil
Test cylinder Faulty ignition switch
compression.
Burned or worn cylinder
piston
Normal Low or no Faulty reed valve
compression compression Blown cylinder head gasket
Leaking crankcase
Start engine by follow- Faulty crankcase oil seal
ing normal starting
procedure.
Incorrectly adjusted idle speed
Engine does not Engine fires but Air leaking through intake
fire does not start pipe
Incorrect ignition timing
Remove spark plug and
inspect again.
Flooded carburetor
Dry spark plug Wet spark plug Throttle valve excessively
open
Wait for 30 minutes and
then remove the carbu-
retor auto choke circuit
hose and blow the hose
with mouth.
Not clogged Clogged Faulty auto bystarter
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