At Yamaha they are throwing it away, and the best way to show how happy they are is to give their engineers carte blanche to make the bikes they like, with the solutions that seem best to them. For 2010 Yamaha has presented this new version of the Yamaha YZ450F cross. What happens to them is that, not being happy with their previous model, they have decided to mount a rather special engine on this new model.
In addition to installing electronic injection, they have turned the cylinder head and placed the intake at the front, while the exhaust now exits the rear of the engine. With this, they make the intake duct as straight as possible and also prevent the injection module from being in the dirtiest area of the motorcycle.
The main idea of this new engine is to place the masses of the motorcycle as centered as possible, thus achieving a more neutral response from the entire motorcycle and allowing you to move it better both in curves and jumps.
The engine has made a small revolution, since by reversing the position of the supply and the exhaust the cylinder has had to tilt backwards, something that has always been considered impossible. Practically all motorcycles in history have had their cylinders vertical or with different forward inclination. (We are talking about single cylinder engines) The use of electronic injection requires mounting a good number of sensors that monitor the throttle position, as well as sensors for intake pressure, intake air temperature, atmospheric pressure, crankshaft rpm, and coolant temperature.
A petrol pump very compact made of plastic resins. The advantage of using a fuel pump is that the fuel tank can be placed anywhere on the motorcycle, so this Yamaha YZ450F has re-positioned the tank under the seat, thus further increasing the concentration of fuel. masses at the center of gravity. The last pearl that this motorcycle has is a control unit that allows you to vary the injection volume maps and the ignition advance map. Come on, you will not be lacking with what to entertain yourself between manga and manga.
The exhaust has also undergone a reform, as it now has to screw on itself to keep the overall length similar to the previous one. The funny thing is that someone has thought that with that shape the exhaust system had to be called Hurricane. Perhaps with this new arrangement what is also achieved is having the entire exhaust assembly much more protected and preventing the pilot from being burned by it in the event of a fall.
The chassis has also had to be reformed, now using a structure made of aluminum Bilateral Beam that combines different types of aluminum depending on the area of the chassis. This chassis is supported by new suspensions, with greater absorption capacity at the rear and 10 mm more travel up front. All focused on improving the general handling of the bike on the track.
In short, Yamaha has thrown the house out of the window and put a revolutionary motorcycle on the market. Hopefully the bet turns out as well as on street bikes.