New
for 2005
Faster and smoother than ever.
Redesigned combustion chamber, piston, intake ports, carburetor
jetting and airbox for improved combustion efficiency, resulting
in smoother more controlled power delivery.
Redesigned CDI unit for smoother more controlled power delivery.
Primary drive gear ratio has been changed from 2.82 to 2.65:1,
clutch spring rate is reduced 6 percent for lighter lever pull,
and a new shift mechanism provides more positive shifting.
All-new fork with TCV (transfer control valve) for stable damping,
improved mid- to full-stroke performance and better rider feedback.
New, aluminum Renthal handlebar is 90 grams lighter and more durable.
Revised triple clamps for even better handling.
Shorter, re-routed front brake hose for increased brake feel and
easier bleeding.
Stronger swingarm with stronger new linkage for better performance.
Rear shock has a new, full-rebound oil lock circuit for a smoother
ride.
New-design rear sprocket and chain guide reduces wear, chain wobble,
and noise for more efficient power transfer.
Rear brake bracket is 35 grams lighter, and designed for easier
rear wheel installation.
New front fork protectors are larger for better coverage..
Engine:
Liquid-cooled, 449cc, 5-valve, DOHC, four-stroke with titanium
valves features 63.4mm stroke delivering flat, broad torque curve
(for instant hook-up) with high over-rev capacity and crisp, linear
throttle response.
39mm Keihin FCR flat-slide carburetor with throttle position sensor
(TPS) and leak jet delivers precise fuel/air mixture and instant
throttle response.
Lightweight crankshaft keeps inertial mass to a minimum for faster-revving
low-rpm response.
Lightweight forged piston with short skirt and small pin diameter.
Lightweight, titanium valves and load-reduced springs are super-light,
minimizing reciprocating mass for fast-revving, hard-hitting power
delivery across the rev range.
Additional weight-saving engine features include: small-design
cam chain tensioner and oil pump; aluminum oil hose; all-titanium
exhaust header, flange, bracket and heat shield; and light CDI
ignition unit.
Primary kickstarting (with automatic decompression and convenient
handlebar-mounted hot start lever) ensures easy restarts.
Kick pinion gear is separate from the primary driven gear, for
smoother clutch engagement.
Redesigned airbox with new double-ribbed carburetor joint for
improved seal and serviceability.
Smooth-shifting 4-speed transmission delivers engine’s potent
powerband to the ground with maximum efficiency and hook-up.
Large-capacity radiator provides outstanding cooling efficiency.
Trick, works-style clutch lever features oversize barrel adjuster
for easy, on-the-fly adjustability of lever/cable play..
Chassis/Suspension:
Super-strong frame is lightweight and rigid for minimal flex and
razor-sharp handling.
More weight savings come via two-piece (part aluminum, part plastic)
engine protector plates and thin-walled engine guard construction.
Removable aluminum rear subframe constructed of square-section
pipe for light weight and easy maintenance.
Rear suspension system features fully adjustable Kayaba shock
with improved rebound circuitry, 12.4 inches of travel, and separate
adjusters for high- and low-speed compression damping.
Lightweight front wheel hub for less unsprung weight and increased
durability.
Lightweight front and rear brake calipers with aluminum pistons
and anti-bubble front master cylinder, 250mm front and 245mm rears
discs, deliver strong stopping power with progressive feel.
Premium Dunlop 739 knobbies provide unbeatable, competition-spec
traction and great wear.
Lightweight 21-inch front and 19-inch rear Excel rims are exceptionally
durable and reduce unsprung weight.
Additional Features:
“Gripper” style seat cover offers excellent feel and
control.
Wide, cleated, folding titanium footpegs are light, strong, and
provide excellent comfort, grip and ground clearance.
Cleated rear brake lever and folding shift lever tip offer superb
grip and excellent durability.
Repackable exhaust silencer.
Durable, comfortable handlebar grips.
Stainless steel clutch cable for longer life. But over time and
hard use parts should be replaced as regular maintenence, to provide
safe operation for all of our customers. Find all your OEM
Yamaha Parts online
