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Yamaha YZ450F 2021 - Page 49

Yamaha YZ450F 2021
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ENGINE SPECIFICATIONS
2-4
Clutch spring free length limit 45.60 mm (1.80 in)
Push rod bending limit 0.10 mm (0.004 in)
Drivetrain
Primary reduction ratio 2.609 (60/23)
Transmission type Constant mesh 5-speed
Gear ratio
1st 1.929 (27/14)
2nd 1.533 (23/15)
3rd 1.300 (26/20)
4th 1.091 (24/22)
5th 0.952 (20/21)
Main axle runout limit 0.08 mm (0.0032 in)
Drive axle runout limit 0.08 mm (0.0032 in)
Secondary reduction ratio 3.769 (49/13)
Final drive Chain
Air filter
Air filter element Wet element
Air filter oil grade Yamaha foam air filter oil or other quality foam
air filter oil
Fuel pump
Pump type Electrical
Maximum consumption amperage 2.4 A
Fuel injector
Resistance 12.0
Throttle body
ID mark BR91
Idling condition
Engine idling speed 1900–2100 r/min
Coolant temperature 70–80 C (158–176 F)
Fuel line pressure (at idle) 300–390 kPa (3.0–3.9 kgf/cm², 43.5–56.6 psi)
Throttle grip free play 3.0–5.0 mm (0.12–0.20 in)

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