| | | | First Look : 2008 Yamaha WR250X, School of drift |  Written: 12/09/2007 : 11:36. Read 9497 times (38/day). | | The integrality of this filed article is for Premium Members. | New bike in the Supermoto range, here is the Yamaha WR250X. Small Supermoto presented to be very fun but most of all easy! Light and nimble this WR250X will be, without a doubt, a real pleasure factory...
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At Yamaha it seems that they don't like compromises, and the aim of this WR 250X are just put aside the R1 model aim...
« No-compromise, highly-focused machines that offer riders a new level of engine and handling performance. »
To convince you here is a piece of the development goals :
Aggressive supermoto performance
New levels of agility and cornering performance
Race-bike performance and user-friendly features
Environmentally responsible low-emission engine
Fresh and aggressive styling
This new bike is also a Enduro Model called WR250R, for those who wants to take a ride in the fields and gravel roads... nice to begin or just to have fun without fear...
WR250 Engine
The WR250R is equipped with a newly-designed engine, a compact liquid-cooled 4-stroke DOHC layout running with the same big 77.0 mm bore and short 53.6mm stroke as Yamaha’s Grand Prix winning YZ250F motocrosser and WR250F enduro bikes.
The all-new short-stroke engine features a specially designed 4-valve cylinder head with a compact pent-roof combustion chamber which helps the WR250R deliver instant throttle response and performance right through the rev range to its maximum power output at 10,000 rpm. The 4-valve layout permits the use of a centrally-located spark plug for quicker ignition flame spread – and by offering a reduced surface area, the pent-roof combustion chamber allows more complete combustion of the fuel/air mix.
In order to achieve class-leading power output and outstanding response, the new cylinder head features a high 11.8:1 compression ratio, and utilises extra-large titanium intake valves which are of a relatively greater diameter than the exhaust valves compared to a traditional 4-valve design. In addition, the high-lift camshafts have been specially treated by our WPC (Wonder Process Craft) technique which involves spraying fine powder at a high speed to increase surface hardness and reduce frictional losses.
The new WR250R is equipped with a fuel injection system – the first time this has been used on a Yamaha ...
The integrality of this filed article is for Premium Members.
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