+ Add a photo

Motocross Bikes

2021Yamaha YZ450F

Rate this bike

43 fields on record

The 2021 Yamaha YZ450F is a high-performance motocross bike engineered for competitive riders seeking class-leading power and precision. Its potent 449cc four-stroke engine with titanium valves and advanced fuel injection delivers aggressive acceleration and reliable top-end performance on demanding tracks. The YZ450F is renowned for its exceptional handling, lightweight construction, and winning heritage in professional motocross racing.

Capacity: 449.0 ccm
Engine: Single, four-stroke
Gearbox: 5-speed
Dry weight: 99.3 kg
Seat height: 965 mm
Power: 56.0 HP (41.2 kW)

⇄ Compare with another bike ＋ Add to garage All model years

What’s new for the 2021 Yamaha YZ450F

vs the 2020

Spec	2020	2021
Torque	39.7 Nm (4.0 kgf-m or 29.3 ft.lbs) @ 7100 RPM	44.3 Nm (4.5 kgf-m or 32.7 ft.lbs) @ 7400 RPM

Other years 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail97%

Cornering88%

City riding10%

Daily riding10%

Touring10%

Two-up5%

Track90%

Best for: Built purely for motocross racing and hard off-road riding, excelling on tracks and rough terrain rather than street use.
Built for: Sharp, high-revving, and razor-responsive, it rewards committed, active riding with explosive acceleration and precise cornering manners.
Not ideal for: It is not suited for commuting, touring, passengers, or casual low-speed street riding due to its lack of lights, mirrors, and road-going comfort features.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

Worked out in your browser - nothing is sent to us

Your height

Inseam (optional)

Units

At 965mm, a rider of 68.9" with a 31" (estimated) inseam will not reach the ground comfortably on the 2021 Yamaha YZ450F, with a cramped knee angle of around 85 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at over 900 mm — Sky High →

Find bikes that fit your height →

Full specifications

Engine

Capacity: 449.0 ccm
Power: 56.0 HP (41.2 kW)
Torque: 44.3 Nm (4.5 kgf-m) @ 7400 RPM
Engine type: Single, four-stroke
Power/weight ratio: 0.5639 HP/kg (dry)
Bore x stroke: 97.0 x 60.9 mm
Compression: 13.0:1
Cooling system: Liquid
Fuel system: Injection
Starting: Electric
Ignition: TCI
Valves per cylinder: 4
Lubrication system: Wet sump

Transmission

Gearbox: 5-speed
Transmission type: Manual
Final drive: Chain
Clutch: Multiplate wet clutch

Dimensions & weight

Wheelbase: 1486 mm
Overall length: 2184 mm
Overall width: 826 mm
Overall height: 1275 mm
Seat height: 965 mm
Dry weight: 99.3 kg
Wet weight: 111.1 kg
Fuel capacity: 6.10 litres
Ground clearance: 330 mm
Oil capacity: 1.00 litres

Chassis & suspension

Frame: Bilateral beam frame, aluminum
Front suspension: KYB Speed-Sensitive System, inverted fork: fully adjustable
Rear suspension: KYB® single shock; fully adjustable
Front wheel travel: 310 mm
Rear wheel travel: 318 mm
Rake (fork angle): 27.0°
Trail: 119 mm

Brakes & wheels

Front brakes: Single disc. Hydraulic.
Front brakes diameter: 270 mm
Rear brakes: Single disc. Hydraulic.
Rear brakes diameter: 245 mm
Front tyre: 80/100-21
Rear tyre: 120/80-19

Other

Color options: Team Yamaha Blue
Comments: Launch control. Power Tuner via smartphone. Torque is a rear-wheel dyno figure.

Specs last verified against published sources: October 2026.

Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.

What changed, year to year

Differences highlighted

Specification	2004	2010	2016	2021	2027
Capacity	449 cc	449 cc	449 cc	449 cc	450 cc
Dry weight	97 kg	99 kg	99 kg	99 kg	99 kg
Seat height	995 mm	998 mm	975 mm	965 mm	965 mm
Fuel capacity	6.8 L	6.1 L	7.6 L	6.1 L	6.1 L

Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.

Rider Reviews

—

☆☆☆☆☆

Be the first to rate

MotorcycleDB

The 2021 Yamaha YZ450F motorcycle is a game-changer in the world of motocross bikes. With its powerful 449cc engine, advanced suspension system, and lightweight design, this bike is built to dominate the track. The electric start and precise handling make it easy for riders to maintain control and push the limits of their performance. Whether you're a seasoned racer or a weekend warrior, the YZ450F offers an exhilarating ride that will leave you craving more.

In addition to its impressive performance features, the 2021 Yamaha YZ450F motorcycle also boasts a sleek and modern design that is sure to turn heads. The bold graphics and aggressive styling make a statement on the track, while the ergonomic layout ensures a comfortable and confident ride. With its cutting-edge technology and innovative engineering, the YZ450F sets a new standard for motocross bikes in 2021. If you're looking for a bike that delivers top-tier performance and unmatched style, the 2021 Yamaha YZ450F is the perfect choice.

Own one? Add it to My Garage and write an owner review with an Owner badge.