Yamaha 250GETO Service Manual page 280

TRBL
SHTG
Symptom 1: Engine will not start (engine cranks)
Symptom 2
—
Fuel not sup-
plied
Crank position sensor
Spark plug does
malfunction
not spark (all
cylinders)
Spark plug does
not spark
*1 See the wiring diagram
9-3
Troubleshooting
Cause 1
Deterioration or dirty
fuel
Fuel supplied to the
carburetor improperly
Carburetor malfunc-
tion
Engine stop lanyard
switch malfunction
Short, open, or loose
connection in ignition
coil ground circuit
Spark plug malfunction
Short, open or loose
connection in ignition
coil circuit
Ignition coil malfunction
CDI unit malfunction
Cause 2
—
Replace the new fuel.
Fuel line
Check the fuel line.
malfunction
Fuel pump
Check the fuel pump.
malfunction
Adjust and check the
—
carburetor.
— Check for continuity.
Check the crank
—
position sensor.
Check the wiring
—
harness continuity.
Check the ignition
— spark, check the spark
plug wires.
Spark plug gap Check the spark plug
improperly gap and condition.
Check the wiring
—
harness continuity.
Ignition coil Change the ignition coil
resistance out and check the ignition
of specifications spark.
Measure the CDI out-
CDI unit output
put peak voltage.
peak voltage
Change the CDI unit
less than speci-
and check the ignition
fications
spark.
Checking step
Refer
to
page
—
3-2
4-14
4-10
8-16
8-11
*1
8-8
3-3
*1
8-8
8-9
8-8
6S35H11