Service manual

Page 147 of 151
18. TROUBLESHOOTING
18.1 ENGINE DOES NOT RUN
• Check fuel flow to carburetor
o No fuel in fuel tank
o Clogged float valve
o Clogged fuel tank cap breather hole
o Clogged at fuel tube
• Spark test – weak or no spark
o Faulty spark plug
o Fouled spark plug
o Faulty CDI unit
o Faulty alternator
o Faulty engine stop switch
o Poorly connected, broken, or shorted wires
o Broken or shorted ignition coil
o Broken or shorted spark plug wire
o Faulty pulse generator
o Faulty ignition switch
• Low cylinder compression
o Worn cylinder or piston rings
o Damaged cylinder head gasket
• Attempt to start engine – engine starts but dies
o Auto choke off or damaged
o Auto choke power wire disconnected
o Improperly adjusted air screw
o Improperly ignition timing
o Fuel / air mixture ratio is too lean
• Attempt to start engine – engine does not fire – inspect spark plug
o Carburetor flooded
o Improperly adjusted air screw
o Fuel / air mixture ratio too rich
o Auto choke stuck or damaged
o Air cleaner dirty
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