Starting Failure/Hard Starting; Fuel System; Electrical System - Yamaha 5KM2-AE1 Service Manual

NOTE:
The following troubleshooting does not cover all the possible causes of trouble. It should be helpful,
however, as a guide to troubleshooting. Refer to the relative procedure in this manual for inspection,
adjustment and replacement of parts.

STARTING FAILURE/HARD STARTING

FUEL SYSTEM

Fuel tank
Empty
G
Clogged fuel filter
G
Clogged fuel strainer
G
Clogged fuel breather hose
G
Deteriorated or contaminated fuel
G
Fuel cock
Clogged fuel hose
G

ELECTRICAL SYSTEM

Spark plug
Improper plug gap
G
Worn electrodes
G
Wire between terminals broken
G
Improper heat range
G
Faulty spark plug cap
G
Ignition coil
Broken or shorted primary/secondary
G
Faulty spark plug lead
G
Broken body
G
CDI system
Faulty CDI unit
G
Faulty pickup coil
G
Faulty charging/rotor rotation direction coil
G
Broken woodruff key
G
STARTING FAILURE/HARD STARTING
TROUBLESHOOTING
Carburetor
Deteriorated or contaminated fuel
G
Clogged pilot jet
G
Clogged pilot air passage
G
Sucked-in air
G
Deformed float
G
Worn needle valve
G
Improperly sealed valve seat
G
Improperly adjusted fuel level
G
Improperly set pilot jet
G
Clogged starter jet
G
Starter plunger malfunction
G
Air filter
Clogged air filter element
G
Switches and wiring
Faulty main switch
G
Faulty engine stop switch
G
Broken or shorted wiring
G
Faulty gear position switch
G
Faulty start switch
G
Faulty rear brake switch
G
Starter motor
Faulty starter motor
G
Faulty starter relay
G
Faulty starter clutch
G
10 - 1
TRBL
SHTG