2017 Yamaha YZ250F - Demo Bike

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2017 Yamaha YZ250F - Demo Bike

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Featuring a "reversed" rear slanted engine design for mass centralization, minimal bodywork and a proven KYB "SSS" suspension system, the YZ450F offers class leading power in a 250 sized chassis. The YZ450F balances the 3 essential elements of an ultimate motocrosser: easy cornering, lightweight & compactness and a deep, useable power band.

Features include:

  • Revised air filter cover & fasteners
  • Revised rear wave-style brake rotor
  • New tire tread pattern front & rear
  • Revolutionary reversed engine design with front mounted FI system & rear exiting exhaust
  • Mass centralizing rearward-slanted-cylinder helps keeps weight centred in the chassis
  • Launch Control System
  • "Battery-less" 44mm throttle body FI & easy access airbox
  • Compact aluminum Bilateral Beam frame & aluminum swingarm
  • Industry-leading, fully adjustable KYB® "SSS" fork & Monocross rear suspension
  • Large 270 mm front disc brake & twin piston caliper
  • GYTR® Power Tuner Ready


  • Design goals for the YZ450F are a balance of easy cornering, a lightweight & compact feeling due to excellent mass centralization and a deep power band tuned for excellent "ride-ability & controllability".
  • "Reversed" liquid-cooled, 450cc, DOHC, 4-valve (titanium), 4-stroke, single with fuel injection.
  • Rearward slanted, reversed cylinder design.
  • "Reversed" engine design (FI system is front mounted, exhaust exits from rear of cylinder).
  • Compact 4-valve cylinder head features a 12.5:1 compression ratio.
  • Lightweight, hollow intake & exhaust cams
  • Lightweight titanium valves use load-reduced oval valve springs.
  • Automatic cam chain tensioner.
  • Lightweight, ceramic composite plated aluminum cylinder.
  • Cylinder is "offset" relative to the crankshaft (to exhaust side)
  • Cylinder "cutaways" allow air "trapped" under the piston to enter a side chamber (or cutaway).
  • Crankcase also utilizes special "cutaways"
  • Lightweight, short-skirt, forged aluminum piston.
  • Piston oil cooler jet nozzle directs oil to the cylinder, rod & underside of piston.
  • Carburized (type of heat treatment) connecting rod for excellent durability.


  • Compact, lightweight "Bilateral Beam" aluminum frame.
  • Lightweight, tapered aluminum swingarm.
  • Lightweight detachable rear sub frame.
  • Adjustable handlebar holders offer a total of 4 different handlebar positions with an adjustment range of 30mm.
  • 48mm, adjustable, inverted, Kayaba "SSS" cartridge fork with 310mm (12.2") of wheel travel.
  • Fork features a twin-chamber, "Speed Sensitive System" design
  • Fork also features a Transfer Control Valve (TCV).
  • Large "wrap-around" plastic fork protectors provide excellent lower fork tube protection.
  • Monocross link rear suspension with 315 mm (12.4") of wheel travel.
  • 270mm floating front "wave-style" disc & compact Nissin twin piston caliper.

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