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1. GENERAL INFORMATION Mongoose/KXR 90/50
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
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 valve passage
Remove spark plug and
install it into spark plug
cap to test spark by Faulty spark plug
connecting it to engine Fouled spark plug
ground Faulty ignition unit
Spark jumps Weak or no spark Faulty pulser coil
Broken or shorted ignition coil
Broken or shorted exciter coil
Faulty ignition switch
Weak or dead battery
Test cylinder
compression
Faulty starter clutch
Valve clearance too small
Valve stuck open
Normal Low or no Worn cylinder, piston and piston
compression compression rings
Leaking cylinder head gasket
Start engine by follow-
ing normal starting
procedure
Air leaking through intake pipe
Engine does not Engine fires but Leaking intake manifold
fire does not start Incorrect ignition timing
Incorrectly adjusted air screw
Remove spark plug and
inspect again
Flooded carburetor
Dry spark plug Wet spark plug Clogged air cleaner
Throttle valve excessively open
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