Equipped with the most advanced performance-boosting technology in its class, the YZ250F’s all-new engine is the most powerful production 250cc 4-stroke ever manufactured by Yamaha, giving you the highest level of tuneable performance ever seen in the 250cc class.



  • Engine Type – 250cc liquid-cooled DOHC 4-stroke; 4 titanium valves
  • Bore x Stroke – 77.0mm x 53.6mm
  • Compression Ratio – 13.5:1
  • Fuel Delivery – Keihin® fuel injection, 44mm
  • Ignition – TCI: Transistor Controlled Ignition
  • Transmission – Wide-ratio constant-mesh 6-speed; multiplate wet clutch
  • Final Drive – O-ring chain

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