Yamaha EK25BMH Service Manual - Trouble Analysis

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