Yamaha EK25BMH, Service Manual

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TROUBLE ANALYSIS
9-1
E
TRBL
ANLS
9
TROUBLE ANALYSIS
NOTE:
The following items should be checked before the "TROUBLE ANALYSIS CHART" is con-
sulted.
1. The battery is charged and its specific gravity is within specification.
2. There are no incorrect wiring connections.
3. Wiring connections are properly secured and are not rusty.
4. The lanyard is installed onto the engine stop switch.
5. The shift position is in neutral.
6. Fuel is reaching the carburetor/vapor separator.
7. The rigging and engine setting are correct.
8. The engine is free from any "Hull problem".
TROUBLE ANALYSIS CHART
Trouble mode Check elements
ENGINE WILL N
O
T S
T
AR
T
HAR
D S
T
AR
TING
ROUGH IDLING HIGH IDLING ENGINE S
T
ALLS
POOR A
C
CELERA
TION
ENGINE WILL N
O
T S
T
OP
POOR PERFORMANCE LIMITED ENGINE SPEED O
V
ERH
E
A
T
ING
L
OOSE S
T
EERING
HAR
D SHIFTIN
G
IRRE
GULAR W
A
RNING INDICA
T
ION
POOR BA
TTER
Y CH
ARGING
Relative part
Reference
Chapter
FUEL SYSTEM
: : :
Fuel line 4
: : :
Fuel joint 4
: : : : :
Fuel filter 4
: : :
Fuel pump 4
: : : : : :
Carburetor 4
: : : : :
• Idle speed adjustment 3
: : :
• Pilot screw adjustment 3
: : :
Link adjustment 3
POWER UNIT
: : : :
Compression 3
: : : :
Reed valves 5
: : : : :
Cylinder head gasket 5