YAMAHA YFZ450R 2021 Owners Manual

10-3
10
6. Put the frame on stands or blocks to raise all
wheels off the ground. (Alternatively, turn the
wheels each month to prevent the tires from
degrading in one spot.)
7. Cover the muffler outlet with a plastic bag to prevent moisture from entering it.
8. Remove the battery and fully charge it. (See page 9-43.)
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11
EBU25964
SPECIFICATIONS
Dimensions:Overall length:1795 mm (70.7 in)
Overall width: 1240 mm (48.8 in)
Overall height:
1065 mm (41.9 in)
Seat height: 810 mm (31.9 in)
Wheelbase: 1270 mm (50.0 in)
Ground clearance:
235 mm (9.3 in)
Minimum turning radius: 3.6 m (11.81 ft)
Maximum water depth: 35 cm (14 in)Weight:Curb weight:184.0 kg (406 lb)Loading:Maximum load:
100.0 kg (220 lb)
(Total weight of rider, cargo, accessories, and tongue)Noise and vibration level:Noise level (77/311/EEC):85.9 dB(A) at 3750 r/min Uncertainty of measurement:
3.0 dB(A)
A-weighted sound power level: 99.0 dB(A) at 3750 r/min
Uncertainty of measurement: 3.0 dB(A)
Vibration on seat (EN1032, ISO5008):
Will not exceed 0.5 m/s²
Uncertainty of measurement: 0.1 m/s²
Vibration on handle (EN1032, ISO5008): 2.9 m/s²
Uncertainty of measurement:
0.8 m/s²
Engine:Combustion cycle:4-stroke
Cooling system:
Liquid cooled
Valve train: DOHC
Number of cylinders: Single cylinder
Displacement:
449 cm³
Bore × stroke:
95.0 × 63.4 mm (3.74 × 2.50 in)
Compression ratio: 11.8 : 1
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Starting system:Electric starter
Lubrication system: Dry sumpEngine oil:Recommended brand:
SAE viscosity grades:
5W-30, 10W-30, 10W-40, 15W-40, 20W-40, 20W-50
Recommended engine oil grade: API service SG type or higher, JASO standard MA
Quantity: Oil change:1.40 L (1.48 US qt, 1.23 Imp.qt) With oil filter removal:
1.45 L (1.53 US qt, 1.28 Imp.qt)
Coolant quantity:Radiator (including all routes):
1.25 L (1.32 US qt, 1.10 Imp.qt)
Coolant reservoir (up to the maximum level mark): 0.25 L (0.26 US qt, 0.22 Imp.qt)Air filter:Air filter element:
Wet element
Air filter oil grade: Foam air-filter oilFuel:Recommended fuel:
Premium unleaded gasoline (Gasohol [E10] acceptable)
Minimum research octane: 97
Fuel tank capacity: 10 L (2.6 US gal, 2.2 Imp.gal)
Fuel reserve amount:
3.4 L (0.90 US gal, 0.75 Imp.gal)Throttle body:ID mark:1TD1Spark plug (s):Manufacturer/model:NGK/CR8E
Spark plug gap: 0.7–0.8 mm (0.028–0.031 in)
0 10 30 50 70 90 110 130 F
–20 –10 0 10 20 30 40 50 CSAE 5W-30
SAE 10W-30
SAE 10W-40
SAE 15W-40
SAE 20W-40SAE 20W-50
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Drivetrain:Primary reduction ratio:2.652 (61/23)
Secondary reduction ratio:
2.714 (38/14)
Final drive: Chain
Clutch type: Wet, multiple-disc
Transmission type:
5-speed
Gear ratio: 1st:
2.500 (35/14)
2nd: 2.000 (30/15)
3rd: 1.632 (31/19)
4th:
1.333 (28/21)
5th: 1.095 (23/21)Front tire:Size:
AT21 x 7R10
Manufacturer/model: MAXXIS/MS21Rear tire:Size:
AT20 x 10R9
Manufacturer/model: MAXXIS/MS22
Tire air pressure (measured on cold tires):Vehicle load:0.0–100.0 kg (0–220 lb)
Recommended:
Front: 35.0 kPa (0.350 kgf/cm², 5.0 psi)
Rear:
35.0 kPa (0.350 kgf/cm², 5.0 psi)
Minimum: Front:
32.0 kPa (0.320 kgf/cm², 4.6 psi)
Rear: 32.0 kPa (0.320 kgf/cm², 4.6 psi)Front wheel:Rim size:
10 X 5.5ATRear wheel:Rim size:9 X 8.0ATFront brake:Type:Hydraulic disc brakeRear brake:Type:
Hydraulic disc brakeBrake fluid:Specified brake fluid:DOT 4Front suspension:Type:Double wishbone
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Spring:Coil spring
Shock absorber: Gas-hydraulic damper
Wheel travel:
250 mm (9.9 in)Rear suspension:Type:Swingarm (link suspension)
Spring:
Coil spring
Shock absorber: Gas-hydraulic damper
Wheel travel: 280 mm (11.0 in)Electrical system:System voltage:12 V
Ignition system: TCI
Charging system:
AC magnetoBattery:Model:YTZ7S
Voltage, capacity:
12 V, 6.0 AhLights:Headlight:T19L, 30.0 W/30.0 W Brake/tail light:
LED
Neutral indicator light: LED
Fuel level warning light:
LED
Coolant temperature warning light: LED
Engine trouble warning light: LED
Fuses:Main fuse:20.0 AEBU30403Noise and vibration levels statement (for Eu-
rope)
The figures quoted are emission levels and are not
necessarily safe working levels. Whilst there is a
correlation between the emission and exposure
levels, this cannot be used reliably to determine
whether or not further precautions are required.
Factors that influence the actual level of exposure
of work-force include the characteristics of the
work room, the other sources of noise, etc. i.e. the
number of machines and other adjacent process-
es, and the length of time for which an operator is
exposed to the noise. Also the permissible expo-
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11-5
11sure level can vary from country. This information,
however, will enable the user of the machine to
make a better evaluation of the hazard and risk.
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12
INDEX
AAccessories and loading ................................................ 7-5
Air filter element, cleaning ........................................... 9-22BBattery ......................................................................... 9-43
Brake and clutch levers, checking and lubricating ...... 9-39
Brake fluid, changing ................................................... 9-31
Brake fluid level, checking ........................................... 9-30
Brake lever ..................................................................... 5-5
Brake lever free play, checking the front ..................... 9-32
Brake light switches ..................................................... 9-34
Brake pads, checking the front and rear ..................... 9-29
Brake pedal .................................................................... 5-6
Brake pedal, checking and lubricating ........................ 9-40
Brake pedal height, checking ...................................... 9-32
Brakes .......................................................................... 9-28
Brakes, front and rear .................................................... 6-4
Brake/tail light .............................................................. 9-49CCables, checking and lubricating ................................ 9-38
Chassis fasteners .......................................................... 6-7
Cleaning ....................................................................... 10-1
Clutch lever .................................................................... 5-5
Clutch lever free play, adjusting .................................. 9-35
Coolant .................................................................6-4, 9-20
Coolant, changing ........................................................ 9-22
Coolant temperature warning light ................................ 5-2
Cowling and panels, removing and installing .............. 9-10
DDrive chain ..................................................................... 6-5
Drive chain, lubricating ................................................ 9-38
Drive chain slack .......................................................... 9-36EEngine break-in .............................................................. 7-4
Engine oil ....................................................................... 6-4
Engine oil and oil filter element .................................... 9-14
Engine, start ................................................................... 7-1
Engine stop switch ........................................................ 5-3
Engine trouble warning light .......................................... 5-2FFuel ......................................................................... 5-9, 6-4
Fuel level warning light .................................................. 5-2
Fuel tank cap ................................................................. 5-8
Fuse, replacing ............................................................ 9-46HHandlebar position, adjusting ...................................... 5-23
Handlebar switches ....................................................... 5-3
Headlight beam, adjusting ........................................... 9-49
Headlight bulb, replacing ............................................. 9-46IIdentification numbers ................................................... 1-1
Indicator light and warning lights ................................... 5-1
Instruments, lights and switches ................................... 6-7LLabel locations ............................................................... 2-1
Light switch ................................................................... 5-3
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MMain switch .................................................................... 5-1
Maintenance and lubrication chart ................................9-5
Maintenance chart, emission control system ................ 9-3
Model label ..................................................................... 1-1NNeutral indicator light .....................................................5-1OOwner’s Manual and tool kit .......................................... 9-2PParking ........................................................................... 7-4
Parking brake free play, adjusting ............................... 9-33
Parking brake lever ........................................................ 5-6
Parking on a slope ......................................................... 7-5
Part locations ................................................................. 4-1RRiding your ATV ............................................................. 8-1SSafety information .......................................................... 3-1
Seat .............................................................................. 5-10
Shifting ........................................................................... 7-2
Shift pedal ...................................................................... 5-7
Shift pedal, checking ...................................................9-40
Shock absorber, rear ...................................................5-15
Shock absorbers, front ................................................ 5-11
Spark arrester, cleaning ............................................... 9-26
Spark plug, checking ...................................................9-13
Specifications ............................................................... 11-1
Speed limiter .................................................................. 5-4
Start switch .................................................................... 5-3
Steering shaft, lubricating ............................................ 9-42Storage ........................................................................ 10-2
Suspension, lubricating
the upper and lower arm
pivots ......................................................................... 9-41
Swingarm pivots, lubricating ....................................... 9-41
TThrottle lever .......................................................... 5-4, 6-5
Throttle lever free play, adjusting ................................. 9-28
Tires ............................................................................... 6-5
Troubleshooting ........................................................... 9-50
Troubleshooting charts ................................................ 9-52VValve clearance ............................................................ 9-28
Vehicle identification number ......................................... 1-1WWheel hub bearings, checking ..................................... 9-40
Wheel, installing ........................................................... 9-50
Wheel, removing .......................................................... 9-49YYamalube ..................................................................... 9-20
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EBU26174
WARNING
ALWAYS
:
• use proper riding techniques to avoid
vehicle overturns on hills and rough
terrain and in turns.

seriously affect handling and control.
Improper ATV use can result in SEVERE INJURY or DEATH.
NEVER USE
WITH DRUGS
OR ALCOHOL
ALWAYS USE
AN APPROVED HELMET AND
PROTECTIVE GEAR NEVER USE
ON PAVED ROADS NEVER CARRY
PASSENGERS
NEVER
operate:


conditions.

another vehicle.

balance and steering and increase risk
of losing control.
LOCATE AND READ OWNER’S MANUAL. FOLLOW ALL INSTRUCTIONS AND WARNINGS.\
PRINTED IN USA
2020.11-0.3× 1 CR (E)
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