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61U5H11
9-4
9
8
7
6
5
4
3
2
1
Trouble shooting the power unit
Refer
Symptom 2
Cause 1
Cause 2
Checking step
to
page
Fuel not sup-
plied properly
Carburetor malfunction
Disassemble and
check the carburetor.
4-12
Float height
improperly
Spark plug malfunction
Spark plug
sparks
improperly
*1
Short, open or loose
connection in ignition
coil circuit and ground
circuit
Check the wiring har-
ness continuity.
—
Ignition coil malfunction
Ignition coil
resistance out
of specifications
5-8
8-6
Change the ignition coil
and check the ignition
spark.
8-8
5-8
8-6
CDI unit malfunction
Measure the charge
coil output peak voltage
and resistance.
Change the CDI unit
and check the ignition
spark.
CDI unit output
peak voltage
less than speci-
fications
3-3
Check the spark plug
gap and condition.
Spark plug gap
improperly
Cylinder head gasket
malfunction
Reed valves
malfunction
Disassemble and
check the reed valves.
Check the compression
pressure.
5-1
5-24
5-1
5-35
Low compres-
sion pressure
—
—
Scratched piston or
wear the piston rings
Check the compression
pressure and disas-
sembling the power
unit.
Scratched cylinder wall
—
*1
See the wiring diagram
61U5H11_09 05.10.11 9:16 Page 5
Содержание 115B
Страница 1: ...115B SERVICE MANUAL 61U 28197 5H 11 140B E115A E115A 115B 140B ...
Страница 4: ......
Страница 79: ...61U5H11 4 18 9 8 7 6 5 4 3 2 1 MEMO ...
Страница 136: ...POWR 5 55 61U5H11 Power unit MEMO ...
Страница 159: ...61U5H11 6 22 9 8 7 6 5 4 3 2 1 Shimming Shimming 6G46090E T3 M3 M4 M1 M2 T1 T2 F R P ...
Страница 255: ......
Страница 256: ...YAMAHA MOTOR CO LTD Printed in Japan Oct 2005 1 2 1 E_1 Printed on recycled paper E115A 115B 140B ...