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Symptom 2
Fuel not sup-
Carburetor malfunction
plied properly
Spark plug malfunction
Short, open or loose
connection in ignition
coil circuit and ground
circuit
Spark plug
sparks
Ignition coil malfunction
improperly
CDI unit malfunction
Cylinder head gasket
malfunction
Reed valves
malfunction
Low compres-
sion pressure
Scratched piston or
wear the piston rings
Scratched cylinder wall
*1 See the wiring diagram
61U5H11
Cause 1
Cause 2
Float height
improperly
Spark plug gap
improperly
Ignition coil
resistance out
of specifications
CDI unit output
peak voltage
less than speci-
fications
Trouble shooting the power unit
Checking step
Disassemble and
check the carburetor.
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.
Check the compression
—
pressure.
Disassemble and
—
check the reed valves.
Check the compression
pressure and disas-
—
sembling the power
unit.
Refer
to
page
1
4-12
3-3
2
*1
3
5-8
8-6
8-8
4
5-8
8-6
5
5-1
5-24
6
5-1
5-35
7
8
9
9-4
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