2018 Yamaha YZ250F
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The 2-straight MX & SX West Champ and undisputed benchmark in 250 motocross bikes.Features may include:
The liquid-cooled, DOHC 4-valve, fuel-injected engine features a forward-positioned straight downdraft intake with symmetrical intake and exhaust ports. A compact, high compression combustion chamber delivers outstanding engine character with a focus on top-end power delivery.Piston, Rod and Crankshaft Balance
A flat-top forged piston features a bridge-box design for additional strength with minimal weight. The piston, rings and DLC-coated piston pin, along with the offset cylinder configuration, all reduce friction loss and contribute to quick response. The engine’s intake ports, cam profiles, high-strength connecting rod and optimized crank and counterbalancer all work together to produce potent high-rpm power with user-friendly delivery and exceptional reliability.Advanced ECU and Fuel Injection
The adjustable fuel injection system uses a 44mm throttle body fed by a high-pressure battery-less electric fuel pump. This ensures optimum fuel atomization and air/fuel calibration for excellent rideability in a wide range of riding conditions. The system controls the volume of fuel injected and the ignition timing based on engine rpm and throttle opening, providing hesitation-free response and controllability.
A Yamahas renowned bilateral beam aluminum frame features compact overall dimensions that balance minimal weight with the strength and rigidity needed for race-winning performance. The frames swingarm pivot section and engine mounting brackets are tuned for stability, responsiveness and sharp cornering.Mass-Centralization
The engine, aluminum muffler and fuel tank are positioned close to the machines center of gravity. This layout contributes to centralized mass for a lightweight handling feeling on the track. The wide 55mm footpegs help lower the riders center of gravity for improved machine balance, control and rider comfort.270mm Front Brake
A large 270mm front brake disc is the same system fitted to the YZ450F™, and uses an aggressive pad material for exceptional stopping power and braking control. Out back, a durable heat-resistant rear rotor boosts brake durability.
Yamaha’s unique embedded graphics are built into the bodywork for extended durability, resisting both peeling and damage.Adjustable Handlebar Mounts
The 4-position adjustable handlebar mounts are rubber mounted to improve comfort and reduce handlebar vibration.Race Winning Details
The YZ450F includes top-spec details, including 1-1/8” aluminum tapered handlebars, wide 55mm footpegs, a quick-adjust clutch perch, stylish black rims and gold chain.
SubcategoryOff-Road / Dirt Bike
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