Yamaha YZ250F

The YZ250F has been a successful machine for the Kemea Yamaha Official MX2 Team and sets the standard for 250cc four-stroke competition motocross bikes. Yamaha Racing have been putting up the numbers on the YZ250F since 2001 and the bike has been praised for combining the broad-power profile of the four-stroke engine while maintaining the lighter, more maneuverable form of the smaller 125cc bikes.

The YZ250F has seen its share of exciting times in the MX2 category, but none more so than the 2005 season where Yamaha Riders’ Antonio Cairoli, Andrew McFarlane and Alessio Chiodi placed first, second and third in the championship riding the YZ250F.

With over a decade and a half of real world racing experience and a constantly evolving engineering philosophy behind it, a new generation of YZ250F was launched in 2018, complete with an electric start engine. Not only that, the overhauled YZ250F is narrower and more compact, and offers extra stability and control over rough terrain, which makes for better braking and even greater traction. The power delivery is more linear which means the bike has a smooth delivery of power and acceleration is optimized. In 2019, the Monster Energy Kemea Yamaha MX2 looks to add to the YZ250F’s impressive legacy with both riders manning the all-new machine inside the FIM MX2 World Championship.

Main titles
2001 Ernesto Fonseca: – AMA-SX Lites West Coast Champion
2002 Chad Reed: AMA-SX Lites East Coast Champion
2004 Chad Reed: AMA-SX 250 Champion
2005 Antonio Cairoli: MX2 World Champion
2007 Antonio Cairoli: MX2 World Champion
2008 Jason Lawrence: AMA-SX Lites West Coast Champion
2009 Christophe Charlier: EMX250 Champion
2012 Kiara Fontanesi: WMX Champion
2012 Mel Pocock: EMX250 Champion
2013 Kiara Fontanesi: WMX Champion
2014 Kiara Fontanesi: WMX Champion
2015 Kiara Fontanesi: WMX Champion
2017 Kiara Fontanesi: WMX Champion
2018 Kiara Fontanesi: WMX Champion

Technical Specifications


  • Model:
  • YZ250F
  • Engine type:
  • Single cylinder, liquid-cooled, 4-stroke, DOHC, 4-valves
  • Displacement:
  • 250cc
  • Bore x stroke:
  • 77.0 mm x 53.6 mm
  • Compression ratio:
  • 14.5 : 1
  • Lubrication system:
  • Wet sump
  • Clutch type:
  • GYTR Wet, multiple disc
  • Fuel system:
  • GET twin injector Fuel Injection
  • Ignition system:
  • Starter system:
  • Kick
  • Transmission system:
  • Constant Mesh, 5-speed
  • Final transmission:
  • Chain


  • Frame:
  • Semi double cradle
  • Front suspension system:
  • Factory Upside down telescope KYB spring front fork
  • Front travel:
  • 310 mm
  • Caster angle:
  • 26o 50
  • Trail:
  • 118 mm
  • Rear suspension system:
  • Swingarm, (link suspension)
  • Rear travel:
  • 315 mm
  • Front brake:
  • Moto Master Hydraulic single disc 270mm
  • Rear brake:
  • Moto Master Hydraulic single disc, 245mm
  • Front tyre:
  • 80/100-21 Dunlop
  • Rear tyre:
  • 110/90-19 Dunlop


  • Overall length:
  • 2,170 mm
  • Overall width:
  • 825 mm
  • Overall height:
  • 1,280 mm
  • Seat height:
  • 965 mm
  • Wheel base:
  • 1,475 mm
  • Minimum ground clearance:
  • 330 mm
  • Wet weight (including full oil):
  • 105 kg
  • Fuel tank capacity:
  • 7.5 litres
  • Oil capacity:
  • 0.9 litres