Yamaha E115A Service Manual page 245

Symptom 2
Stuck piston
Manual starter
Piston lock due to
or starter motor
water or oil in the com-
operates, but
bustion chamber
the engine does
not crank
Salt buildup on the
drive shaft and bushing
Symptom 1: Engine will not start (engine cranks)
Symptom 2
Deterioration or dirty
—
fuel
Fuel supplied to the
carburetor improperly
Fuel not
supplied
Carburetor malfunction
Engine stop lanyard
switch malfunction
Spark plug malfunction
Short, open or loose
connection in ignition
coil circuit and ground
circuit
Spark plug does
not spark
Ignition coil malfunction
CDI unit malfunction
*1 See the wiring diagram
61U5H11
Cause 1 Cause 2
Cause 1 Cause 2
Fuel filter
malfunction
Fuel joint
malfunction
Fuel pump
malfunction
Spark plug gap
improperly
Ignition coil
resistance out
of specifications
CDI unit output
peak voltage
less than speci-
fications
Troubleshooting the power unit
Checking step
Disassemble and
—
check the power unit.
Disassemble and
—
check the upper case.
Checking step
— Replace the new fuel.
Check the fuel filter for
clog.
Check the fuel joint
pressure.
Check the fuel pump.
Adjust and check the
—
carburetor.
— Check for continuity.
Check the spark plug
gap and condition.
Check the wiring har-
—
ness continuity.
Change the ignition coil
and check the ignition
spark.
Measure the charge
coil output peak voltage
and resistance.
Change the CDI unit
and check the ignition
spark.
Refer
to
page
1
5-17
2
7-13
3
Refer
to
page
4
—
3-2
5
4-17
4-16
6
4-12
8-10
7
3-3
*1
8
5-8
8-6
9
8-8
5-8
8-6
9-2