Starting Problems; Engine; Fuel System; Electrical Systems - Yamaha XVS250 2001 Service Manual

EAS00844
NOTE:
The following guide for troubleshooting does not cover all the possible causes of trouble. It should be
helpful, however, as a guide to basic troubleshooting. Refer to the relative procedure in this manual for
checks, adjustments, and replacement of parts.

STARTING PROBLEMS

ENGINE

Cylinders and cylinder heads
D Loose spark plug
D Loose cylinder head
D Damaged cylinder head gasket
D Worn or damaged cylinder
D Incorrect valve clearance
D Incorrectly sealed valve
D Incorrect valve-to-valve-seat contact
D Incorrect valve timing
D Faulty valve spring
D Seized valve
Pistons and piston rings
D Incorrectly installed piston ring
D Damaged, worn or fatigued piston ring
D Seized piston ring
D Seized or damaged piston
Air filter
D Incorrectly installed air filter
D Clogged air filter element
Crankcase and crankshaft
D Incorrectly assembled crankcase
D Seized crankshaft

ELECTRICAL SYSTEMS

Battery
D Faulty battery
D Discharged battery
Fuse
D Blown, damaged or incorrect fuse
D Incorrectly installed fuse
Spark plug
D Incorrect spark plug gap
D Incorrect spark plug heat range
D Fouled spark plug
D Worn or damaged electrode
D Worn or damaged insulator
D Faulty spark plug cap
Ignition coils
D Damaged ignition coil
D Broken or shorted primary or secondary coils
D Faulty spark plug lead
STARTING PROBLEMS
TROUBLESHOOTING

FUEL SYSTEM

Fuel tank
D Empty fuel tank
D Clogged fuel filter
D Clogged fuel tank breather hole
D Deteriorated or contaminated fuel
Fuel cock
D Clogged or damaged fuel hose
Carburetor
D Deteriorated or contaminated fuel
D Clogged pilot jet
D Clogged pilot air passage
D Sucked-in air
D Damaged float
D Worn needle valve
D Incorrectly installed needle valve seat
D Incorrect fuel level
D Incorrectly installed pilot jet
D Clogged starter jet
D Faulty starter plunger
D Incorrectly adjusted starter cable
Ignition system
D Faulty TCI unit
D Faulty pickup coil
Switches and wiring
D Faulty main switch
D Faulty engine stop switch
D Broken or shorted wiring
D Faulty neutral switch
D Faulty start switch
D Faulty sidestand switch
D Faulty clutch switch
D Incorrectly grounded circuit
D Loose connections
Starting system
D Faulty starter motor
D Faulty starter relay
D Faulty neutral relay
D Faulty starter clutch
8-1
TRBL
SHTG