AMA MX 250 - Yamaha YZ250F

The Monster Energy Star Yamaha Racing YZ250F is packed full of race winning innovation and proven technology. Derived from a production model Yamaha YZ250F, the race version includes a host of advancements starting with the engine that has been developed to deliver a broad torque curve giving the racer an, “easy to ride” feel, and provides a high RPM power to aid in getting off to great starts.

Other upgrades include suspension with the KYB PSF1 fork known for its light weight, and great adjustability on race day, along with a Vortex ECU in which the team develops its own custom maps within the Vortex software to achieve optimal performance at every race. Each year the entire team works hard to create custom parts out of titanium and other lightweight materials with the goal of getting the motorcycle as light as possible per the rule book. No stone goes unturned, from triple clamps to engine mounts, from fuel to tyres, race development and testing is a never-ending process that continues all year long.

Main titles
2018 Aaron Plessinger: AMA 250 MX Champion
2018 Aaron Plessinger: AMA 250 West SX Champion
2016 Cooper Webb : AMA 250 MX Champion
2016 Cooper Webb : AMA 250 West SX Champion
2015 Jeremy Martin : AMA 250 MX Champion
2015 Cooper Webb : AMA 250 West SX Champion
2014 Jeremy Martin: AMA 250 MX Champion
2010 Jessica Patterson: AMA WMX Champion
AMA-MX-YZ250F

Technical Specifications

Bike

  • Model:
  • YZ250F
  • Engine type:
  • 4-stroke, liquid-cooled, DOHC, 4-valves
  • Displacement:
  • 250cc
  • Bore x stroke:
  • 77.0mm × 53.6mm
  • Compression ratio:
  • 13.8:1
  • Lubrication system:
  • Yamalube
  • Clutch type:
  • Rekluse Torque Drive
  • Fuel system:
  • Mikuni® fuel injection, 44mm
  • Ignition system:
  • Vortex ECU
  • Starter system:
  • OEM Electric
  • Transmission system:
  • Constant-mesh 5-speed; multiplate wet clutch
  • Final transmission:
  • Chain

Chassis

  • Frame:
  • Bilateral beam frame
  • Chassis:
  • OEM Standard
  • Front suspension system:
  • Telescopic fork, KYB
  • Front travel:
  • 310 mm
  • Caster angle:
  • 27.33°
  • Trail:
  • 4.7 in
  • Rear suspension system:
  • linkage, KYB
  • Rear travel:
  • 120 mm
  • Front brake:
  • Hydraulic single disc, Braking Ø 270 mm
  • Rear brake:
  • Hydraulic single disc, Braking Batfly
  • Front tyre:
  • Dunlop Mx33
  • Rear tyre:
  • Dunlop MX33

Dimensions

  • Overall length:
  • 2,174 mm
  • Overall width:
  • 825 mm
  • Overall height:
  • 1,285 mm
  • Seat height:
  • 970 mm
  • Wheel base:
  • 1,475 mm
  • Minimum ground clearance:
  • 335 mm
  • Wet weight (including full oil):
  • 102 kg
  • Fuel tank capacity:
  • 6 litres
  • Oil capacity:
  • 0.90 litres