The 2012 Yamaha YZ250F has the most reliable engine in the 250 class and in the right hands it has the capacity to be among the fastest bikes on the National/Supercross circuit. In 2012 Yamaha continues with the Keihin FCR carburetor, producing a broader powerband and more horsepower than a EFI 250—especially when joined to a series of intelligent upgrades.

For the new year, the YZ250F Yamaha receives a 2mm large carb bore from 37mm to 39mm, for a more top-end power—especially from 8000 rpm to 12,000 rpm. Yamaha reduced the reciprocating mass of the piston and the balance of the crankshaft, reducing vibrations at the bars, pegs, and saddle. There is also a new air filter cage that flows more air to go along with the revised engine mapping and a muffler with an 8mm smaller core diameter. The piston is 8.7% lighter than it was last year. Plus, there are new piston rings with reduced friction and a lighter piston pin and circlips. The crankshaft balance and counter-balancer have been revised for a smoother performance. Additionally, the connecting rod and big-end bearing get a new heat-treating process for more strength and improved durability.

2012 YZ250F SUSPENSION:

The Kayaba Speed Sensitive System front forks have been revalved to ride higher in their stroke, to lessen diving, and the spring rate has been increased from 0.45 kg/mm to 0.46 kg/mm. The outer fork tube has been reshaped to provide a better flex characteristic. The fork offset has been changed from 25mm to 22mm and the steering stem has been increase in length. The 46 mm Kayaba SSS rear shocks have been revised damping and a 16mm shock shaft. The axle blocks at the back of the swingarm have been increased to increase the rigidity of the rear axle. Finally, the gearing gets an improved 50-tooth rear sprocket.

2012 YZ250F CHASSIS AND HANDLING

For 2012 the Yamaha YZ250F is given a new frame:

1. The new frame is made of 20 different cast, forged, machined and extruded pieces.

2. The frame rails have been changed from a double-box extrusion to a triple box extrusion for more rigidity.

3. the sections of the frame that houses the swingarm pivot have been increased in width and thickness to support the rear suspension on all axis for more precise handling.

4. The motor mounts have been changed in thickness and shape.

Don’t miss out on the opportunity to own a great off-road vehicle to fit the need of any rider.