18. TROUBLESHOOTING
ENGINE DOES NOT START OR IS HARD TO START
CAUSE OF TROUBLE
(1)Fuel tank empty.
(2)Fuel tube up to the fuel tank
clogged, or the vacuum tube or fuel
tube up to the inlet pipe clogged.
(3)Float valve clogged.
(4)Fuel tank cap air hole clogged.
(5)Fuel supply pipe frozen.
(6)Fuel strainer clogged.
(1)Faulty spark plug.
(2)Contaminated spark plug.
(3)Faulty CDI unit.
(4)Faulty A.C. generator.
(5)Disconnected or shorted high
tension cord.
(6)Disconnected or shorted ignition
coil.
(7)Faulty main switch.
(1)Piston ring seized.
(2)Cylinder and piston ring won.
(3)Cylinder and cylinder head cracked.
(4)Crank case air leaks.
(5)Cylinder head gasket damaged.
(1)Manifold air leaks.
(2)Inadequate ignition timing.
(1)Carburetor flooded.
(2)Faulty control box.
(3)Throttle valve excessively opened.
1. Open the drain screw, and check fuel
flow to the carburetor.
2. Check spark plugs.
3. Test cylinder pressure.
4. Start engine in the following
procedure.
5. Remove spark plugs.
Fuel not supplied
to the carburetor.
Weak or no spark.
Engine starts but
stops immediately.
Plugs wet.
18-1
Fuel is supplied.
Good spark
Pressure normal
Dry plugs
Engine will not start.
18
Low cylinder pressure.
ENGINE DOES NOT START OR IS HARD TO START
18-1
ENGINE OUTPUT INSUFFICIENT
18-2
POOR PERFORMANCE AT LOW SPEED AND IDLING
18-3
POOR PERFORMANCE AT HIGH SPEED
18-3
UNSATISFACTORY OPERATION
18-4
FUEL GAUGE
18-6
STARTER MOTOR
18-7
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