TROUBLESHOOTING
9-1
EAM20148
TROUBLESHOOTING
EAM30309
GENERAL INFORMATION
TIP
The following guide for troubleshooting does not
cover all the possible causes of trouble. It should
be helpful, however, as a guide to basic trouble-
shooting. Refer to the relative procedure in this
manual for checks, adjustments, and replace-
ment of parts.
EAM30310
STARTING FAILURES
Engine
1. Cylinder and cylinder head
•
Loose spark plug
•
Loose cylinder head or cylinder
•
Damaged cylinder head gasket
•
Damaged cylinder gasket
•
Worn or damaged cylinder
•
Incorrect valve clearance
•
Improperly sealed valve
•
Incorrect valve-to-valve-seat contact
•
Incorrect valve timing
•
Faulty valve spring
•
Seized valve
2. Piston and piston ring(s)
•
Improperly installed piston ring
•
Damaged, worn or fatigued piston ring
•
Seized piston ring
•
Seized or damaged piston
3. Air filter
•
Improperly installed air filter
•
Clogged air filter element
4. Crankcase and crankshaft
•
Improperly assembled crankcase
•
Seized crankshaft
Fuel system
1. Fuel tank
•
Empty fuel tank
•
Clogged fuel tank breather hose
•
Deteriorated or contaminated fuel
•
Clogged or damaged fuel hose
2. Fuel pump
•
Faulty fuel pump
3. Throttle body
•
Deteriorated or contaminated fuel
•
Sucked-in air
Electrical system
1. Battery
•
Discharged battery
•
Faulty battery
2. Fuse
•
Blown, damaged or incorrect fuse
•
Improperly installed fuse
3. Spark plug
•
Incorrect spark plug gap
•
Incorrect spark plug heat range
•
Fouled spark plug
•
Worn or damaged electrode
•
Worn or damaged insulator
4. Ignition coil
•
Cracked or broken ignition coil body
•
Broken or shorted primary or secondary coils
5. Ignition system
•
Faulty ECU
•
Faulty crankshaft position sensor
•
Broken generator rotor woodruff key
6. Switches and wiring
•
Faulty ECU
•
Faulty engine stop switch
•
Broken or shorted wiring
•
Faulty neutral switch
•
Improperly grounded circuit
•
Loose connections
7. Starting system
•
Faulty starter motor
•
Faulty starter relay
•
Faulty starting circuit cut-off relay
•
Faulty starter clutch
EAM30311
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder and cylinder head
•
Incorrect valve clearance
•
Damaged valve train components
2. Air filter
•
Clogged air filter element
Fuel system
1. Throttle body
•
Damaged or loose throttle body joint
•
Improperly synchronized throttle bodies
•
Improper throttle cable free play
•
Flooded throttle body
Electrical system
1. Battery
•
Discharged battery
•
Faulty battery
2. Spark plug
•
Incorrect spark plug gap
•
Incorrect spark plug heat range
•
Fouled spark plug
•
Worn or damaged electrode
•
Worn or damaged insulator
•
Faulty spark plug cap
Содержание YZ 2019 Series
Страница 6: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY...
Страница 10: ......
Страница 40: ...MOTORCYCLE CARE AND STORAGE 1 28...
Страница 63: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 22...
Страница 66: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 25...
Страница 68: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 27...
Страница 69: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 28 1 Exhaust camshaft 2 Intake camshaft 3 Oil filter element 4 Oil pump...
Страница 70: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 29...
Страница 71: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 30 1 Camshaft 2 Oil pressure check bolt 3 Oil filter element 4 Oil pump...
Страница 72: ...CABLE ROUTING DIAGRAM 2 31 EAM20152 CABLE ROUTING DIAGRAM...
Страница 74: ...CABLE ROUTING DIAGRAM 2 33...
Страница 76: ...CABLE ROUTING DIAGRAM 2 35...
Страница 78: ...CABLE ROUTING DIAGRAM 2 37...
Страница 80: ...CABLE ROUTING DIAGRAM 2 39...
Страница 82: ...CABLE ROUTING DIAGRAM 2 41...
Страница 84: ...CABLE ROUTING DIAGRAM 2 43...
Страница 86: ...CABLE ROUTING DIAGRAM 2 45...
Страница 126: ...ELECTRICAL SYSTEM 3 38...
Страница 177: ...FRONT FORK 4 49 1...
Страница 196: ...CHAIN DRIVE 4 68...
Страница 217: ...CAMSHAFT 5 18 Spark plug Spark plug 13 N m 1 3 kgf m 9 6 lb ft T R...
Страница 237: ...ELECTRIC STARTER 5 38...
Страница 256: ...OIL PUMP AND BALANCER GEAR 5 57 a 2 10 b 2 9 1 b 5 3 a 4 10 5 9 3 E c d 6 7 8 8 b 6...
Страница 262: ...GENERATOR AND STARTER CLUTCH 5 63 1 a 3 3 2 4...
Страница 276: ...TRANSMISSION 5 77...
Страница 284: ...WATER PUMP 6 7...
Страница 290: ...FUEL TANK 7 5 A Left B Right 1 1 A 0 mm 0 in B 1 1 15 mm 0 59 in...
Страница 296: ...THROTTLE BODY 7 11...
Страница 299: ......
Страница 313: ...CHARGING SYSTEM 8 14...
Страница 343: ...FUEL INJECTION SYSTEM 8 44...
Страница 347: ...FUEL PUMP SYSTEM 8 48...
Страница 348: ...ELECTRICAL COMPONENTS 8 49 EAM20147 ELECTRICAL COMPONENTS 9 10 1 3 2 4 5 6 7 8...
Страница 350: ...ELECTRICAL COMPONENTS 8 51 11 10 9 2 3 1 6 7 8 4 5...
Страница 352: ...ELECTRICAL COMPONENTS 8 53 EAM30289 CHECKING THE SWITCHES 4 1 3 2 B B Sb B B B B B B B B...
Страница 353: ...ELECTRICAL COMPONENTS 8 54 1 Engine stop switch 2 Neutral switch 3 Clutch switch 4 Start switch...
Страница 368: ...ELECTRICAL COMPONENTS 8 69...
Страница 376: ...LIST OF SELF DIAGNOSTIC AND FAIL SAFE ACTIONS 9 7...