2009 Yamaha YZ250F, 2009 Yamaha YZ250F Key Features: Ongoing refinement to chassis produce an amazingly balanced, light-handling machine with performance that s accessible to all levels of riders. Five-titanium-valve engine with 13.5:1 compression ratio spins out great torque and horsepower. A carefully tuned aluminum frame made up of forgings, weldings, castings and tubing means sharp, super-precise handling. Mass centralization provides fantastic overall balance and performance A ProTaper® aluminum handlebar in adjustable clamps and Excel rims are just a few tricks up the YZ250F s sleeve. Dry sump lubrication system circulates more oil for the best durability in motocross Features & Benefits NEW FOR 2009: Redesigned exhaust system has a 60mm longer titanium header for better low-end grunt plus a 50mm shorter aluminum silencer for optimum low-rpm throttle response. Both carburetor jetting and CDI ignition mapping settings are precisely reworked to deliver increased engine performance with new exhaust. Engine: Liquid-cooled 250cc, five-titanium-valved, DOHC, four-stroke is powerful and highly tractable, with an rpm redline for competition- crushing pulling power. Liquid-cooled 250cc, five-titanium-valved, DOHC, four-stroke is powerful and highly tractable, with an rpm redline for competition- crushing pulling power. 37mm Keihin® FCR flat-slide carburetor with throttle position sensor (TPS) ensures precise fuel/air mixing and lightning-quick throttle response. Chassis/Suspension: Extensively tested aluminum frame uses a mix of alloy castings, forgings and extrusions to produce a tuned-flex frame that makes the YZ250F the best-handling bike in its class. Speed-Sensitive System 48mm KYB® fork damping force is controlled by piston speed: provides a smoother, more precise ride. Wide (55mm) footpegs provide excellent boot traction and rider comfort.
2010 Yamaha YZ250F, Clean yz250f - The all-new, bilateral beam frame is specific to the 250F and is more compact than the previous generation chassis for superior cornering. The optimized engine delivers a new level of power in the low-to-midrange, with a great torquey feel, exactly where riders want it.