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ENGINE
• High-Tech Four-Stroke Powerplant
• 250cc liquid-cooled, DOHC engine with two titanium intake valves and two steel exhausts, forged piston and direct-plated cylinder for outstanding durability.
• Advanced, High-Revving Cylinder Design
• Pentroof combustion chamber with downdraft-type straight intake helps make excellent power across the rev band, with maximum power at 10,000 rpm.
• Fuel Injection
• First use of fuel injection on a 250 Yamaha on/off- road bike. The system relies on input from a crank sensor, intake air pressure sensor and throttle position sensor feeding a compact ECU to provide optimum combustion.
• EXUP® Exhaust
• An ECU-controlled EXUP® exhaust valve, along with an electronic intake control valve, broadens the powerband for more responsive power.
• Durable Engine Internals
• High-lift cams have WPC surface treatment in which the surface is sprayed with ne powder at over 100 meters per second to increase surface hardness, improving durability and reducing friction losses.
• Compact Engine
• Three-axis engine layout keeps the engine compact. The wet oil sump tucks between frame rails to keep the engine height down and minimize overall chassis size.
• High-Performance Generator
• Rare earth-type ACM alternator keeps the weight down while providing the current needed to run the FI and lighting systems.
• Coil-On-Plug Ignition
• Direct ignition coil sits atop the spark plug, for a high-energy spark and reduced weight compared to conventional coils and high voltage spark plug wires— another rst on a Yamaha on-off road model.
• 6-Speed Transmission
• Six-speed gearbox provides a wide spread of ratios, with shower-type lubrication for reliability. A special light-action clutch makes shifting a snap.
• Compact Muf er
• Tucked-in three-chamber muf er helps keep mass centralized and the bike quiet.
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