Yamaha XVS650 - STARTING FAILURE;HARD STARTING;POOR IDLE SPEED; COMPRESSION SYSTEM; POOR IDLE SPEED PERFORMANCE; POOR MEDIUM-AND HIGH-SPEED PERFORMANCE

STARTING FAILURE/HARD STARTING/POOR IDLE SPEED ISTHRTB~ ?
PERFORMANCE/POOR MEDIUM-AND HIGH-SPEED PERFORMANCE, gf
COMPRESSION SYSTEM
Cylinder and cylinder head
• Loose spark plug
• Loose
cylinder head or cylinder
• Faulty
cylinder head gasket
•
Worn, damaged or seized cylinder
• Improperly sealed valve
•
Improper valve-to-valve seat contact
•
Improper valve timing
• Faulty valve spring
EB901000
POOR IDLE SPEED PERFORMANCE
POOR IDLE SPEED PERFORMANCE
Carburetor
• Improperly returned starter plunger
• Loose
pilot jet
• Clogged pilot air jet
• Improperly synchronized carburetors
•
Improperly adjusted idle speed
(throttle stop screw)
•
Improper throttle cable free play
• Flooded
carburetor
Piston and piston ring
• Improperly installed piston ring
• Worn, fatigued
or broken piston ring
• Seized piston ring
• Seized
or damaged piston
Crankcase and crankshaft
• Improperly seated crankcase
• Seized crankshaft
Electrical system
• Faulty battery
• Faulty spark plug
• Faulty ignitor unit
• Faulty pickup coil
• Faulty
ignition coil
Valve
train
• Improperly adjusted valve clearance
Air filter
• Clogged air filter element
EB902000
POOR MEDIUM-AND HIGH-SPEED PERFORMANCE
POOR MEDIUM-AND HIGH-SPEED PERFORMANCE
Refer to "STARTING FAILURE/HARD STARTING". (Fuel system, electrical system, compres-
sion system and valve train)
Carburetor
• Faulty diaphragm
• Improperly adjusted fuel level
• Clogged
or loose main jet
Air filter
• Clogged air filter element
Fuel pump
• Faulty fuel pump