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YZ450F
449cc4-stroke1 cylLiquid-cooledElectric start
About the YZ450F
Yamaha's flagship 450cc four-stroke motocross racer. Built for 450-class racers and experienced adult riders.
- Family
- YZ450F/FX & YZ400F/426F
- Model years
- 1998 – present
- Also known as
- YZF450, YZ 450 F, YZ400F, YZ426F, YZF400, YZF426
11 sources
- en.wikipedia.org › Yamaha_YZ450F
- dirtaction.com.au
- dirtrider.com › yamaha-yz450f-technical-information
- motocrossactionmag.com › mxa-race-test-2026-yamaha-yz450f
- enduro21.com › first-look-2027-yamaha-off-road-competi…
- ultimatemotorcycling.com › 2023-yamaha-yz450f-first-look-18-fast-f…
- dirtrider.com › first-look-all-new-2014-yamaha-yz250f-a…
- ultimatemotorcycling.com › 2010_yamaha_yz450f_4-stroke_history
- haynes.com › yamaha-yz400f-yz426f-wr400f-wr426f-moto…
- pulpmx.com › maxxis-tires-classic-steel-181-2003-yam…
- cyclenews.com › 2026-yamaha-yz450f-review
Generations
2026 – present
YZ450FCurrentNew frame, bodywork, standard Nissin hydraulic clutch and new KYB shock on the 2023 engine.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 5-speed
- Fuel
- Fuel injection
2023 – 2025
YZ450FAll-new dry-sump engine and new frame, with revised electronics and slimmer bodywork.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 5-speed
- Fuel
- Fuel injection
2018 – 2022
YZ450FElectric start replaced the kickstarter, with a new engine, frame and Power Tuner app.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 5-speed
- Fuel
- Fuel injection
1 source
2014 – 2017
YZ450FAll-new chassis and engine keeping the rearward cylinder, with the air intake moved to the front of the bike.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 5-speed
- Fuel
- Fuel injection
2010 – 2013
YZ450FAll-new fuel-injected, rearward-slanted four-valve engine in a new bilateral-beam aluminum frame.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 5-speed
- Fuel
- Fuel injection
2006 – 2009
YZ450FNew aluminum frame and 5-speed gearbox, with over 300 parts changed.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 5-speed
- Fuel
- Carburettor
1 source
2003 – 2005
YZ450F449cc five-valve carbureted engine in a redesigned steel frame; 4-speed gearbox in 2003–2004, 5-speed from 2005.
- Engine
- 449cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 4-speed
- Fuel
- Carburettor
2000 – 2002
YZ426FAdded: 426cc. Wikipedia's infobox says 2000–2003, its section heading 2000–2002; 2003 was the YZ450F.
- Engine
- 426cc
- Cooling
- Liquid-cooled
- Starter
- Kick start
- Gearbox
- 5-speed
- Fuel
- Carburettor
1998 – 1999
YZ400FAdded: 399cc five-valve, the first modern production four-stroke motocrosser.
- Engine
- 450cc
- Starter
- Kick start
- Gearbox
- 5-speed
- Fuel
- Carburettor
Year specs
- Engine
- 449 cc
- Bore × stroke
- 97 × 60.8 mm
- Cooling
- Liquid-cooled
- Starter
- Electric start
- Gearbox
- 5-speed
- Fuel system
- Fuel injection
- Horsepower
- —
- Torque
- —
- Dry weight
- —
- Wet weight
- 110.2 kg
- Seat height
- 965 mm
- Ground clearance
- 345 mm
- Wheelbase
- 1476 mm
- Fuel capacity
- 6.1 L
- MSRP
- $10,299
engine_cc computed from the cited bore x stroke. Yamaha lists the wet weight with a full tank; Monster Energy Edition MSRP $10,499.
Gallery
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