Speed; Engine; Fuel System; Electrical Systems - Yamaha XF50W Service Manual

STARTING FAILURES/HARD STARTING/
Starting system
8Faulty starter motor
8Faulty starter relay
8Faulty starting circuit cut-off relay
8Faulty starter clutch
INCORRECT ENGINE IDLING SPEED
EAS00847
INCORRECT ENGINE

SPEED

ENGINE

Cylinder and cylinder head
8Incorrect valve clearance
8Damaged valve train components
Air filter
8Clogged air filter element

FUEL SYSTEM

Throttle body
8Damaged or loose throttle body joint
8Improperly ISC(idle speed control) valve
8Improper throttle cable free play
8Flooded throttle body
8Faulty air induction system

ELECTRICAL SYSTEMS

Battery
8Discharged battery
8Faulty battery
Spark plug
8Incorrect spark plug gap
8Incorrect spark plug heat range
8Fouled spark plug
8Worn or damaged electrode
8Worn or damaged insulator
8Faulty spark plug cap
Ignition coil
8Faulty spark plug lead
Ignition system
8Faulty ECU
8Faulty crankshaft position sensor
9-2
TRBL Q
SHTGl •
IDLING