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Yamaha has released information about its all-new 2019 YZ250F. The bike is redesigned from the ground up and is now equipped with electric start and the first smartphone-engine tuning app to come as a stock feature on a production 250cc four-stroke motocross bike. All-new engine, frame, and bodywork are also major focal points of the completely new motorcycle.
Engine
For 2019, Yamaha has refined its distinct rearward-slanted-cylinder design for the engine. Using a compact starter motor and lightweight lithium-ion battery, the 2019 YZ250F is now equipped with electric start, and the liquid-cooled, DOHC, four-valve, fuel-injected engine features a forward-positioned straight downdraft intake with symmetrical intake and exhaust ports. Fuel is delivered by a lighter 44mm throttle body through a new 12-hole Denso injector. A new, higher-compression flat-top forged piston has a bridge-box design for additional strength with minimal weight. The piston, rings, and DLC-coated piston pin, along with the offset cylinder configuration, are all designed to reduce friction loss and contribute to quick response.
SPECIFICATIONS
ENGINE
BORE (MM)77COMPRESSION RATIO13.8:1COOLINGLiquidDISPLACEMENT IN CC249DISPLACEMENT IN CI15.2ENGINE TYPESingle-CylinderSTARTERElectricSTROKE53.6VALVE CONFIGURATIONDOHC
TRANSMISSION
NUMBER OF SPEEDS5TRANSMISSION TYPEManual
TIRES
FRONT TIREBridgestone® Battlecross® X20F 80/100 R21REAR TIREBridgestone® Battlecross® X20R 100/90 R19
BRAKES
FRONT BRAKE DIAMETER270FRONT BRAKE TYPEHydraulic DiscREAR BRAKE DIAMETER9.7REAR BRAKE TYPEHydraulic Disc
SUSPENSION & STEERING
AIR ADJUSTABLENoFRONT SUSPENSION BRAND NAMEKYBFRONT SUSPENSION TYPEInverted ForkREAR ADJUSTABLE REBOUND DAMPINGYesREAR ADJUSTABLE SHOCK / SPRING PRE-LOADYesREAR SUSPENSION BRAND NAMEKYBREAR SUSPENSION TYPETwin Sided Swing ArmSEAT HEIGHT (IN)38.2
OTHER
FUEL CAPACITY (GAL)1.6MANUFACTURER COUNTRYJapanMANUFACTURER TYPEMotorcrossWET WEIGHT (LBS)234WHEELBASE (IN)58.1
