First Look: All New 2014 Yamaha YZ250F and YZ450F — Dirt Rider Magazine

17 Фев 2015 | Author: | Комментарии к записи First Look: All New 2014 Yamaha YZ250F and YZ450F — Dirt Rider Magazine отключены

First Look: All New 2014 YZ250F And YZ450F

The new YZ250F nearly identical to its bigger

YZ250F: Finally Gets But No Air

Offering a radically different from its previous 250cc Yamaha is truly swinging for the in 2014 in the 250F class.

No delaying – EFI is here! Yamaha replaces the carb with a injection system that a Keihin 44mm throttle Another huge change in the department is a rearward-inclined cylinder, like the blue 450. of this new orientation, the YZ250F adopts the bigger bike’s exhaust, forward-facing intake and header.

The four-titanium-valve cylinder is fed by a high-pressure battery-less electric for an optimum fuel/air ratio. All of engine changes were at more power, especially in the rpm range. Also, Yamaha got rid of the oil tank for the YZ250F’s wet sump system.

Though the final specs have not been neither bike will an air fork. According to Yamaha, have been testing but don’t think they are for the YZ-Fs just yet. So the 250F’s suspension isn’t different, the chassis is.

The 250 gets the same treatment the 450 received – hidden gas cap, sub-frame, bilateral beam frame, narrower overall and larger, but lower, two-gallon gas The muffler, due to the wraparound header, is to the center of gravity and along the other changes mentioned toward mass centralization, a focus for Yamaha’s 2014 Also, because of the shorter the sub frame is shorter and lighter, tightening up the bikes overall distribution.

Also available in the YZ250F shares many with the YZ450F.

The 250F’s and rear shock have new specs to compliment the all-new and the shock’s reservoir went horizontal to the more-common vertical Up front, a larger 22mm axle with a new top triple increases rigidity while mounted bars keep from getting too stiff. of the major changes, the air filter a new home in front of the gas tank like the 450F’s.

The 250F’s four-titanium-valve cylinder is fed by a high-pressure battery-less electric

You’ve seen this beam aluminum frame borrowed the design from the

Look familiar? The YZ250F’s header now looks identical to the new exhaust—the very same that the JGRMX race has been running.

A new cylinder piston, ignition timing and EFI lead off the list of engine to the YZ450F.

Yamaha claims the new 450F boasts better end and quicker, smoother shifting.

In the department, the YZ450F gets a new head, maintaining the straight down draft design, new and exhaust valves, which are and the cam profile for the intake has been all contributing to improved combustion, in added power. It also a new piston, ignition timing and injection mapping.

The new ECU boost bottom end power delivers a strong feeling of from 3rd gear up while new ratios also lengthen the and heighten the feeling of power in 2nd and 3rd Newly designed transmission and mechanisms aim to provide quicker, shifting under power less effort.

Just the 250F, the YZ450F now sports a diameter 22mm front while a revised clamp is to aid handling feel.

The white is available for the YZ450F as well. the 250F nor 450F—blue or white—receives an air for 2014.

Yamaha YZ 450 FS

The exhaust pipe is all new and now circles the cylinder, giving the pipe proper length for power. At the same time, the pipe has three different throughout the exhaust tract. new layout allows the silencer to be 7.3 inches further forward, behind the side panel to the middle of the bike which the mass for better handling.

The compact wet sump lubrication with piston cooler jet eliminates the need for an oil tank, engine weight. The water employs a plastic resin for further weight reduction. The size of the crankcase made it to mount the 450cc engine in the new design.

That newly designed bilateral beam frame has similar to the 2013 YZ250F and the head pipe is moved closer to the rider than years YZ450F frame. gives the 450 a compact chassis.

A new for the fuel tank (now 2 instead of 1.5 gallons) and air cleaner box the bike a slimmer feeling the legs as well as positions tank mass closer to the of the bike. A new increased volume allows the bike to be narrower at the by 14mm overall (7mm per and uses a more traditional than before. Access is easier, using only bolts.

The now-larger-volume air box on the YZ450F just north of the gas cap, is hidden behind that clamp-in cover.

The proven KYB air-oil separated are still there with a new inner and outer tube, with new suspension settings. The shock has a new reservoir location to the new gas tank while the spring and settings were changed to the new chassis.

Just like the the front wheel now uses a diameter 22mm front A new top triple clamp works to rigidity for improved handling and end feel. The handlebar mounts are now mounted to improve comfort and handlebar vibration.

Surprisingly, the and YZ450F share the same frame!

If the 2014 YZ250F and YZ450F look a lot alike it is they are. Much other manufactures, Yamaha has the route of the same chassis with a different engine. The new YZ250F and 2014 YZ450F the exact same frame, and subframe, even the same with different settings. The are the same, the bodywork is the same, the clamps the same, you name it.

Even the motor mounts are the Properly executed it is a great for everyone invovlved. It cuts costs and makes acquiring that much easier.

We wait to start testing of these machines!

Yamaha YZ 450 FS
Yamaha YZ 450 FS
Yamaha YZ 450 FS
Yamaha YZ 450 FS
Yamaha YZ 450 FS
Yamaha YZ 450 FS


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