2016 YAMAHA WR 450F check oil

ELECTRICAL COMPONENTS
9-69
4. Install:• Seat
• Side cover (left/right)Refer to “GENERAL CHASSIS” on page 5-
1.
EAS2GC1386CHECKING AND CHARGING THE BATTERYEWA
WARNING
Batteries generate explosive hydrogen gas
and contain electrolyte which is made of
poisonous and highly caustic sulfuric acid.
Therefore, always follow these preventive
measures:
• Wear protective eye gear when handling or working near batteries.
• Charge batteries in a well-ventilated area.
• Keep batteries away from fire, sparks or
open flames (e.g., welding equipment,
lighted cigarettes).
• DO NOT SMOKE when charging or han- dling batteries.
• KEEP BATTERIES AND ELECTROLYTE
OUT OF REACH OF CHILDREN.
• Avoid bodily contact with electrolyte as it can cause severe burns or permanent eye
injury.
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL
• Skin — Wash with water.
• Eyes — Flush with water for 15 minutes and get immediate medical attention.
INTERNAL
• Drink large quantities of water or milk fol-
lowed with milk of magnesia, beaten egg
or vegetable oil. Get immediate medical at-
tention.
ECA
NOTICE
• This is a VRLA (Valve Regulated Lead Ac-id) battery. Never remove the sealing caps
because the balance between cells will not
be maintained and battery performance
will deteriorate.
• Charging time, charging amperage and charging voltage for a VRLA (Valve Regu-
lated Lead Acid) battery are different from
those of conventional batteries. The VRLA
(Valve Regulated Lead Acid) battery
should be charged according to the appro-
priate charging method. If the battery is
overcharged, the electrolyte level will drop
considerably. Therefore, take special care
when charging the battery.
TIP
Since VRLA (Valve Regulated Lead Acid) bat-
teries are sealed, it is not possible to check the
charge state of the battery by measuring the
specific gravity of the electrolyte. Therefore, the
charge of the battery has to be checked by
measuring the voltage at the battery terminals.
1. Remove:• Side cover (left/right)
• SeatRefer to “GENERAL CHASSIS” on page 5-
1.
2. Disconnect: • Battery leads
(from the battery terminals)
ECA
NOTICE
First, disconnect the negative battery lead
“1”, and then positive battery lead “2”.
3. Remove:• Battery
4. Check: • Battery charge
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a. Connect a pocket tester to the battery termi- nals.
TIP
• The charge state of a VRLA (Valve Regulated Lead Acid) battery can be checked by mea-
suring its open-circuit voltage (i.e., the voltage
when the positive battery terminal is discon-
nected).
• No charging is necessary when the open-cir-
cuit voltage equals or exceeds 12.8 V.
b. Check the charge of the battery, as shown in the charts and the following example.
• Positive tester probe 
positive battery terminal
• Negative tester probe 
negative battery terminal
1
2

ELECTRICAL COMPONENTS
9-74
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a. Connect the pocket tester ( 1k) to the
spark plug cap.
b. Measure the spark plug cap resistance.
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EAS2GC1391CHECKING THE IGNITION COIL
1. Disconnect: • Ignition coil terminal(from the sub wire harness)
• Spark plug cap (from the ignition coil)
2. Check:
• Primary coil resistanceOut of specification  Replace.
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a. Connect the pocket tester (  1) to the igni-
tion coil. b. Measure the primary coil resistance.
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3. Check:
• Secondary coil resistanceOut of specification  Replace.
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a. Connect the pocket tester (  1k) to the ig-
nition coil.
b. Measure the secondary coil resistance.
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EAS2GC1392CHECKING THE CRANKSHAFT POSITION
SENSOR
1. Disconnect: • Crankshaft position sensor coupler(from the wire harness)
2. Check:
• Crankshaft position sensor resistanceOut of specification  Replace.
Pocket tester
90890-03112
Analog pocket tester YU-03112-C
Primary coil resistance 2.16–2.64 
Pocket tester 90890-03112
Analog pocket tester YU-03112-C
• Positive tester probe 
Ignition coil terminal 1 “1”
• Negative tester probe 
Ignition coil terminal 2 “2”
Secondary coil resistance 8.64–12.96 k 
Pocket tester 90890-03112
Analog pocket tester YU-03112-C
• Positive tester probe  Ignition coil terminal 1 “1”
• Negative tester probe 
Spark plug lead “2”

ELECTRICAL COMPONENTS
9-76
b. Check the starter motor operation.
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EAS28150CHECKING THE STATOR COIL
1. Disconnect:• Stator coil coupler(from the wire harness)
2. Check:
• Stator coil resistanceOut of specification  Replace the stator
coil.
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a. Connect the pocket tester (  1) to the sta-
tor coil coupler as shown. b. Measure the stator coil resistance.
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EAS2GC1395CHECKING THE RECTIFIER/REGULATOR
1. Check:
• Charging voltageOut of specification  Replace the rectifier/
regulator.
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a. Set the digital tachometer to the ignition coil.
b. Connect the pocket tester (DC 20 V) to the rectifier/regulator coupler as shown.
c. Start the engine and let it run at approxi- mately 5000 r/min.
d. Measure the charging voltage.
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Stator coil resistance 0.528–0.792  (W–W)
Pocket tester 90890-03112
Analog pocket tester YU-03112-C
• Positive tester probe 
White “1”
• Negative tester probe 
White “2”
• Positive tester probe  White “1”
• Negative tester probe 
White “3”
• Positive tester probe  White “2”
• Negative tester probe 
White “3”
No load regulated voltage 14.1–14.9 V
Digital tachometer 90890-06760
Digital tachometer YU-39951-B
Pocket tester 90890-03112
Analog pocket tester YU-03112-C
• Positive tester probe  Red “1”
• Negative tester probe 
Black “2”
123
12

TROUBLESHOOTING
10-1
EAS2GC1406
TROUBLESHOOTING
EAS2GC1407GENERAL 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
troubleshooting. Refer to the relative procedure
in this manual for checks, adjustments, and re-
placement of parts.
EAS2GC1408STARTING 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
EAS2GC1409INCORRECT 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

LIST OF SELF-DIAGNOSTIC AND FAIL-SAFE ACTIONS
10-8
ACTUATOR OPERATION TABLEDiag-
nostic code No. Item Actuation Procedure
30 Ignition coil Actuates the ignition coil five times at one-second inter-
vals.
“WARNING” on the Yamaha
diagnostic tool blinks five
times when the ignition coil is
actuated.Check that a spark is gener-
ated five times.
• Connect an ignition
checker.
36 Injector Actuates the injector five times at one-second inter-
vals.
“WARNING” on the Yamaha
diagnostic tool blinks five
times when the radiator fan
motor relay is actuated.TIP: Before performing
this operation, be sure to
disconnect the fuel pump
coupler.
Check that injector is actu-
ated five times by listening
for the operating sound.
51 Radiator fan motor relay Actuates the radiator fan mo- tor relay five times at five-sec-
ond intervals.
“WARNING” on the Yamaha
diagnostic tool blinks five
times when the radiator fan
motor relay is actuated.Check that the radiator fan
motor relay is actuated five
times by listening for the op-
erating sound.
52 Headlight relay Actuates the headlight relay five times at five-second in-
tervals.
“WARNING” on the Yamaha
diagnostic tool blinks five
times when the headlight re-
lay is actuated.Check that the headlight re-
lay is actuated five times by
listening for the operating
sound.