YAMAHA YZ250F Emergence For Trail Adventure In Year 2010

© Yamaha Motor Corporation, U.S.A.

Yamaha company will return present motorcycle product off-road type YZ250F at year 2010 with a few development. This motorcycle expected by many trail adventurer, off-roader and motocrosser in all this hemisphere. Even between motocrosser try and test it as comparison. Of course we expect type YZ250F this better from previous. Speciality that added from this motorcycle has colour choice more various, usually Yamaha company only give blue colour choice and white. You can see spesification info and several pictures hereunder.

The Features : Designed has bilateral beam frame for type 250 and more compact than previous generation motor frame. Rider seat is closer with wheel in front of, this matter makes rigidity and balance better in drive it. Rider can get quicker gas and cross finish line without exhaustion even alongside match stripe.Engine optimise gives new level a strength from low to mid range, with a great torquey feel, exactly where riders want it. That is due to the new straight intake boot that enhances breathing, new carburetor that provides excellent throttle response and fuel atomization, and redesigned valve train components that reduce inertial mass and boost low end torque. Exhaust is also enhanced with a new D-shaped exhaust port and newly designed exhaust system. Ongoing refinement to the suspension and engine produces an amazingly balanced, light-handling machine with performance thats accessible to all levels of riders. Designed also with new look stresses light heavy bike and nimble handle character. The sharp, bike horizontal line set apart, cleanly, and seen aggresiveer.

Suspension from KYB has been recalibrated in front of and backside and adjusted new bilateral beam frame to unequaled handles. The clutch lever has a lighter pull feel even though the clutch has stronger engagement. The new clutch also has a wider engagement range that will give riders an advantage off the line. No doubt that is YZ250F uncomparable courage from this four-stroke is as motorcycle the 1st four-stroke at market, as the 1st to win at international race, the 1st win at AMA Supercross and the 1st get degree at AMA U. S. Supercross Championship, as good as the 1st win at AMA National race.

Engine : The valve spring retainers are now lightweight aluminum instead of steel, and valve spring pressure is lighter for reduced valve opening force. This contributes to superior low-to-mid range torque characteristics due to less power-robbing friction. Thereâs also a new, higher lift cam profile, while valve stem ends are chromium-nitride coated for exceptional reliability and reduced maintenance. The exhaust port shape has round form. This increases velocity through the port for excellent throttle response, meanwhile also increase strength from engine. The newly designed radiator is lower and further back and the oil tank is more compact and repositioned to achieve greater mass centralization. The carburetor bore has a new venturi shape, plus theres recalibrated jetting and a new accelerator pump.

This translates to impressive response when the rider snaps open the throttle, and contributes to superb torquey low-to-midrange power characteristics. The intake boot offers a straight, smooth tract for excellent engine breathing and more power. The airbox is reshaped to tuck neatly into the Bilateral Beam frame. The exhaust pipe has been carefully tuned to optimize engine power, with a muffler thats 50mm longer and with a narrower core a design that lets the YZ250F comfortably meet the latest noise standards without sacrificing power. Engineers were able to increase the clutch spring load for stronger engagement, yet, thanks to a recalibrated clutch actuation arm cam ratio, lever pull is actually lighter than before. Third and fourth gear ratios are slightly taller, and third, fourth, and fifth gears are stronger than ever with new drive dog shapes for positive engagement. That gives riders a strong gearbox thats been carefully matched to engine power characteristics.

Chassis/Suspension : The Bilateral Beam frame is crafted from a carefully chosen combination of forged and extruded aluminum pieces 20 in all welded together to provide unmatched rigidity balance. The KYB speed-sensitive front fork delivers exceptional damping feel, responsiveness, and bump absorption characteristics. Damping settings are revised, the piston rods have a new surface treatment, and the oil seal is a new design. The 4-way-adjustable KYB rear shock has been redesigned to make the most of the Bilateral Beam frame design. Its lower in the frame for excellent mass centralization, and has new damping characteristics.

The new tank, seat, and rear fender are flat and the relationship between handlebars, pegs, and seat result in a natural, more forward riding position that facilitates rider movement. The fuel tank has been moved toward the center of the bike for mass centralization. The ProTaper bars are four-way adjustable, and handlebar mounts and footpegs are 5mm higher to optimize rider position on the new chassis.

Additional Features : The CDI unit has revised ignition mapping to match new engine intake and exhaust specs.Riders have a choice of two color options: Team Yamaha Blue and White or White and Red.

Engine
Type : 250cc liquid-cooled DOHC 4-stroke; 5 titanium valves
Bore x Stroke : 77.0mm x 53.6mm
Compression Ratio : 13.5:1
Fuel Delivery : Keihin® FCR MX37
Ignition : CDI
Transmission : Constant-mesh 5-speed; multiplate wet clutch
Final Drive : Chain Drive

Chassis
Suspension/Front : Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Suspension/Rear : Fully adjustable single shock; 12.0-in travel
Brakes/Front : Hydraulic single disc brake, 250mm
Brakes/Rear : Hydraulic single disc brake, 245mm
Tires/Front : 80/100-21 Tires/Rear : 110/90-19

Dimensions
Length : 85 in
Width : 32.5 in
Height : 51.3 in
Seat Height : 38.9 in
Wheelbase : 57.7 in
Ground Clearance : 14.8 in
Wet Weight : 224.8 lb
Fuel Capacity : 1.7 gal

See also at DirtRider Magazine