Two New 2008 Bikes From Yamaha (WR and WRX)
? Fresh-sheet design 250cc liquid-cooled, DOHC engine with two
titanium intake valves and two steel exhausts, forged piston and
plated cylinder for outstanding durability.
? Pentroof combustion chamber with downdraft-type straight
intake helps make excellent power across the rev band, with
maximum power at 10,000 rpm.
? First use of fuel injection on a 250 Yamaha on/off-road bike. The
system relies on input from a crank sensor, intake air pressure
sensor and throttle position sensor feeding a compact ECU to
provide optimum combustion.
? An ECU-controlled EXUP exhaust valve, along with an electronic
intake control valve, broadens the powerband.
? Large titanium intake valves with WPC processed high lift cams,
a treatment in which the surface is sprayed with fine powder at
over 100 meters per second to increase surface hardness.
? Three-axis engine layout keeps the engine compact. Wet sump
tucks between frame rails to keep the engine height down.
? Rare earth-type ACM alternator keeps the weight down while providing
all the current needed to run the FI and lighting systems.
? Direct ignition coil sits atop the spark plug?another first on a
Yamaha on-off road model.
? Six-speed gearbox provides a wide spread of ratios, with
shower-type lubrication for reliability. A special light-action
clutch makes shifting a snap.
? Tucked-in, three-chamber muffler keeps the mass concentration
up and the bike quiet.
? Electric start only: Leaving off the kickstarter keeps it light
and simple.
? YZ / WR250-inspired semi-double-cradle frame uses a
main frame of cast and forged aluminum sections, with
high-strength steel downtubes for excellent strength and
rigidity characteristics.
? Asymmetrical swingarm provides excellent strength/rigidity
balance and a dynamic look. Cast aluminum crossmembers,
extruded arms and a 22mm rear axle are carefully tuned for
optimum handling.
? Fully adjustable 46mm fork provides 10.6 inches of wheel
travel. A forged lower triple clamp and a cast upper one help
give outstanding front-end feel. An aluminum steering stem
reduces weight.
? Linkage-mounted rear shock provides 10.6 inches of travel with
adjusters for compression damping, rebound damping and spring
preload?and features a 14mm rod and 46mm cylinder for excellent
damping and fade resistance.
? Wave brake rotors front and rear reduce unsprung weight and
provide excellent performance. Rear pedal is forged aluminum.
? A slim, steel fuel tank is shaped with knee grip in mind, and the
entire ergonomic layout is designed to make the rider feel like
part of the bike.
? Narrow, YZ-inspired seat features gripper-type cover for great
seat-of-the-pants feel. Seat height is 36.6 inches.
? WR enduro-style instrument panel provides excellent visibility
in spite of the compact size. Basic mode provides speed, clock,
tripmeter and self-diagnostic function. Measurement mode
includes stopwatch, distance-compensating tripmeter, etc.
? Minimalist front and rear fenders are designed for function,
simplicity and lightness.
? Fresh-sheet design 250cc liquid-cooled, DOHC engine with two
titanium intake valves and two steel exhausts, forged piston and
plated cylinder for outstanding durability.
? Pentroof combustion chamber with downdraft-type straight
intake helps make excellent power across the rev band, with
maximum power at 10,000 rpm.
? First use of fuel injection on a 250 Yamaha on/off-road bike. The
system relies on input from a crank sensor, intake air pressure
sensor and throttle position sensor feeding a compact ECU to
provide optimum combustion.
? An ECU-controlled EXUP exhaust valve, along with an electronic
intake control valve, broadens the powerband.
? Large titanium intake valves have WPC coating, a surface
treatment in which the surface is sprayed with fine powder at
over 100 meters per second to increase surface hardness.
? Three-axis engine layout keeps the engine compact. Wet sump
tucks between frame rails to keep the engine height down.
? Rare earth-type ACM alternator keeps the weight down
while providing all the current needed to run the FI and
lighting systems.
? Direct ignition coil sits atop the spark plug?another first on a
Yamaha on-off road model.
? Six-speed gearbox provides a wide spread of ratios, with showertype
lubrication for reliability. Special, light-action clutch makes
shifting a snap.
? Tucked-in, three-chamber muffler keeps the mass concentration
up and the bike quiet.
? Electric start only: Leaving off the kickstarter keeps it light
and simple.
CHASSIS/SUSPENSION:
? 17-inch wheels mount radial street rubber in 110 front and
140mm rear widths and help lower the seat approximately 1.4
inches compared to the WR250R.
? One-tooth smaller rear sprocket (13/42) works with the
smaller-diameter tires to bring out the WR250X’s strong accelerating
character.
? Stiffer springs front and rear and street-oriented damping
settings reduce pitch compared to the WR250R for excellent
pavement performance.
? YZ/WR250-inspired semi-double-cradle frame uses a
main frame of cast and forged aluminum sections, with
high-strength steel downtube for excellent strength and
rigidity characteristics.
? Asymmetrical swingarm provides excellent strength/rigidity
balance and a dynamic look. Cast aluminum crossmembers,
extruded arms and a 22mm rear axle are carefully tuned for
optimum handling.
? Fully adjustable 46mm fork provides 10.6 inches of wheel travel.
A forged lower triple clamp and a cast upper one help give
outstanding front-end feel. An aluminum steering stem reduces
weight.
? Linkage-mounted rear shock provides 10.4 inches of travel
with adjusters for compression damping, rebound damping and
spring preload?and features a 14mm rod and 46mm cylinder for
excellent damping and fade resistance.
? Wave brake rotors front and rear, including a large, 298mm front
disc, reduce unsprung weight and provide excellent performance.
Rear pedal is forged aluminum.
? A slim, steel fuel tank is shaped with knee grip in mind, and the
entire ergonomic layout is designed to make the rider feel like
part of the bike.
? Narrow, YZ-inspired seat features gripper-type cover for great
seat-of-the-pants feel. Seat height is 35.2 inches.
? WR enduro-style instrument panel provides excellent visibility
in spite of the compact size. Basic mode provides speed, clock,
tripmeter and self-diagnostic function. Measurement mode
includes stopwatch, distance-compensating tripmeter, etc.
? Minimalist front and rear fenders are designed for function,
simplicity and lightness.
? Bodywork with separate radiator heat outlet helps keep engine
and rider cool.
? Lightweight headlight and LED taillight maximize visibility and
draw less current.
? Separate clutch cover means easier serviceability.
? One-screw air filter serviceability.
? Adjustable front brake lever.
? Bodywork with separate radiator heat outlet helps keep engine
and rider cool.
? Lightweight headlight and LED taillight maximize visibility and
draw less current.
? Adjustable front brake lever.
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