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8. Check the differential gear case for oil leak-
age. If oil is leaking, check for the cause.
EBU23472CoolantThe coolant level should be checked regularly. In
addition, the coolant must be changed at the in-
tervals specified in the periodic maintenance and
lubrication chart.
TIPIf genuine Yamaha coolant is not available, use an
ethylene glycol antifreeze containing corrosion in-
hibitors for aluminum engines and mix with dis-
tilled water at a 1:1 ratio. NOTICEECB02190Mix antifreeze with distilled water only. Howev-
er, if distilled water is not available, soft water
may be used for refilling. Do not use hard water
or salt water since they are harmful to the en-
gine. EBU2712ATo check the coolant level1. Park the ATV on a level surface.TIPThe coolant level must be checked on a cold en-
gine since the level varies with engine tempera-
ture. 2. Check the coolant level in the coolant reser- voir.
Tightening torque:
Differential gear oil filler bolt:23 N·m (2.3 kgf·m, 17 lb·ft)
Recommended coolant: YAMALUBE coolant
Coolant quantity: Coolant reservoir (up to full level):0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator (including all routes): 1.32 L (1.40 US qt, 1.16 Imp.qt)
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Carbon dioxide (CO2) level:Carbon dioxide (CO2) emissions (2016/1628):1015.0 g/kWh (YFM450FWB, YFM450FWBD)Engine:Combustion cycle:4-stroke
Cooling system: Liquid cooled
Valve train:
SOHC
Number of cylinders: Single cylinder
Displacement: 421 cm³
Bore × stroke:
84.5 × 75.0 mm (3.33 × 2.95 in)
Compression ratio: 10.0 : 1
Starting system: Electric starter
Lubrication system:
Wet 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: 2.30 L (2.43 US qt, 2.02 Imp.qt)
With oil filter removal: 2.40 L (2.54 US qt, 2.11 Imp.qt)
Final gear oil:Type:Yamaha Friction Modified Shaft Drive Gear Oil
Quantity: 0.38 L (0.40 US qt, 0.33 Imp.qt)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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Differential gear oil:Type:Yamaha Friction Modified Plus Shaft Drive Oil (Part No.: ACC-SHAFT-PL-32) or SAE 80 API GL-4 Hypoid gear oil
(B5R1/B5R2/B5R3)
Yamaha Friction Modified Shaft Drive Gear Oil or SAE 80 API GL-4 Hypoid gear oil
(BJ5H/BB5R/BJ5D/BJ5E/BB5M)
Quantity: 0.23 L (0.24 US qt, 0.20 Imp.qt) (B5R1/B5R2/B5R3)
0.35 L (0.37 US qt, 0.31 Imp.qt)
(BJ5H/BB5R/BJ5D/BJ5E/BB5M)Coolant quantity:Radiator (including all routes):1.32 L (1.40 US qt, 1.16 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:Regular unleaded gasoline (Gasohol [E10] acceptable)
Minimum research octane: 91
Fuel tank capacity:
14 L (3.7 US gal, 3.1 Imp.gal)
Fuel reserve amount: 4.0 L (1.06 US gal, 0.88 Imp.gal)
Throttle body:ID mark:BB51 00Spark plug (s):Manufacturer/model:NGK/DR7EA
Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)Drivetrain:Primary reduction ratio:1.000
Secondary reduction ratio: 7.944 (39/24 x 24/18 x 33/9)
Final drive:
Shaft
Clutch type: Wet, centrifugal, shoe
Transmission type: CVT automatic with reverse
Gear ratio:
Transmission ratio:2.550–0.750 : 1
Reverse gear:
1.706 (29/17)
Low range: 2.813 (45/16)
High range: 1.652 (38/23)Front tire:Size:AT25x8-12
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Manufacturer/model:CHENG SHIN/CU905Rear tire:Size:
AT25x10-12
Manufacturer/model: CHENG SHIN/CU906Tire air pressure (measured on cold tires):Recommended (For Oceania):
Front: 35.0 kPa (0.350 kgf/cm², 5.0 psi)
Rear:
30.0 kPa (0.300 kgf/cm², 4.4 psi)
Minimum (For Oceania): Front:
32.0 kPa (0.320 kgf/cm², 4.6 psi)
Rear: 27.0 kPa (0.270 kgf/cm², 4.0 psi)
No cargo or trailer (For Europe):
Recommended: Front:
35.0 kPa (0.350 kgf/cm², 5.0 psi)
Rear: 30.0 kPa (0.300 kgf/cm², 4.4 psi)
Minimum: Front: 32.0 kPa (0.320 kgf/cm², 4.6 psi)
Rear: 27.0 kPa (0.270 kgf/cm², 4.0 psi) With cargo or trailer (For Europe):
Recommended:
Front: 50.0 kPa (0.500 kgf/cm², 7.3 psi)
Rear:
50.0 kPa (0.500 kgf/cm², 7.3 psi)
Minimum: Front:
45.0 kPa (0.450 kgf/cm², 6.5 psi)
Rear: 45.0 kPa (0.450 kgf/cm², 6.5 psi)
Front wheel:Rim size:
12 x 6.0ATRear wheel:Rim size:12 x 7.5ATFront brake:Type:Hydraulic disc brakeRear brake:Type:
Mechanical wet multiple disc brakeBrake fluid:Specified brake fluid:DOT 4Front suspension:Type:Double wishbone
Spring: Coil spring
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