Incorrect Engine Idling Speed; Engine; Fuel System; Electrical Systems - Yamaha XP500 2001 Service Manual

INCORRECT ENGINE IDLING SPEED/ POOR
MEDIUM-AND-HIGH-SPEED PERFORMANCE
Switches and wiring
S Faulty main switch
S Faulty engine stop switch
S Broken or shorted wiring
S Faulty front, rear or both brake switches
S Faulty start switch
S Faulty sidestand switch
S Improperly grounded circuit
S Loose connections
EAS00847

INCORRECT ENGINE IDLING SPEED

ENGINE

Cylinder(-s) and cylinder head(-s)
S Incorrect valve clearance
S Damaged valve train components
Air filter
S Clogged air filter element

FUEL SYSTEM

Carburetor(-s)
S Faulty starter plunger
S Loose or clogged pilot jet
S Loose or clogged pilot air jet
S Damaged or loose carburetor joint
S Improperly synchronized carburetors
S Improperly adjusted engine idling speed
(throttle stop screw)
S Improper throttle cable free play (at the
flange of the throttle grip)
S Flooded carburetor
Autochoke unit
S Faulty starter plunger
S Improperly adjusted starter cable
S Faulty ignitor unit
EAS00849

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE

Refer to "STARTING PROBLEMS".
ENGINE
Air filter
S Clogged air filter element
Air intake system
S Bent, clogged or disconnected carburetor air
vent hose
S Clogged or leaking air duct
FUEL SYSTEM
Carburetor(-s)
S Faulty diaphragm
S Incorrect fuel level
S Loose or clogged main jet
Fuel pump
S Faulty fuel pump
Starting system
S Faulty starter motor
S Faulty starter relay
S Faulty starting circuit cut-off relay
S Faulty starter clutch

ELECTRICAL SYSTEMS

Battery
S Improperly charged battery
S Faulty battery
Spark plug(-s)
S Incorrect spark plug gap
S Incorrect spark plug heat range
S Fouled spark plug
S Worn or damaged electrode
S Worn or damaged insulator
S Faulty spark plug cap
Ignition coil(-s)
S Faulty spark plug lead
Ignition system
S Faulty ignitor unit
S Faulty pickup coil
9-2
TRBL
SHTG