Incorrect Engine Idling Speed; Engine; Fuel System; Electrical Systems - Yamaha XVS250 2001 Service Manual

INCORRECT ENGINE IDLING SPEED/POOR MEDIUM AND-
HIGH-SPEED PERFORMANCE/FAULTY GEAR SHIFTING
EAS00846

INCORRECT ENGINE IDLING SPEED

ENGINE

Cylinders and cylinder heads
D Incorrect valve clearance
D Damaged valve train components
Air filter
D Clogged air filter element

FUEL SYSTEM

Carburetor
D Faulty starter plunger
D Loose or clogged pilot jet
D Loose or clogged pilot air jet
D Damaged or loose carburetor joint
D Incorrectly adjusted engine idling speed
(throttle stop screw)
D Incorrect throttle cable free play
D Flooded carburetor
EAS00848

POOR MEDIUM-AND-HIGH-SPEED PERFORMANCE

Refer to "STARTING PROBLEMS".
ENGINE
Air filter
D Clogged air filter element
EAS00850

FAULTY GEAR SHIFTING

SHIFTING IS DIFFICULT

Refer to "CLUTCH DRAGS".

SHIFT PEDAL DOES NOT MOVE

Shift shaft
D Incorrectly adjusted shift rod
D Bent shift shaft
Shift drum and shift forks
D Foreign object in a shift drum groove
D Seized shift fork
D Bent shift fork guide bar
Transmission
D Seized transmission gear
D Foreign object between transmission gears
D Incorrectly assembled transmission

ELECTRICAL SYSTEMS

Battery
D Faulty battery
D Discharged battery
Spark plugs
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 Broken or shorted primary or secondary
coils
D Faulty spark plug lead
D Damaged ignition coil
Ignition system
D Faulty CDI unit
D Faulty pickup coil
FUEL SYSTEM
Carburetor
D Faulty diaphragm
D Incorrect fuel level
D Loose or clogged main jet

JUMPS OUT OF GEAR

Shift shaft
D Incorrect shift pedal position
D Incorrectly returned stopper lever
Shift forks
D Worn shift fork
Shift drum
D Incorrect axial play
D Worn shift drum groove
Transmission
D Worn gear dog
8-2
TRBL
SHTG