- The industry's most powerful and most advanced
4-stroke MX machine returns stronger, lighter (by over
10+ pounds!) and better-handling than ever!
- All-new, liquid-cooled, 449cc, 5-valve, DOHC,
4-stroke with titanium valves features longer 63.4mm stroke
(up from 60.1mm) and completely new-design cylinder head,
piston and crankshaft, delivering flatter, broader torque
(for instant hook-up) with higher over-rev capacity and
crisper, more linear throttle response.
- Cylinder head is smaller in design for reduced
weight.
- All-new, lighter-weight crankshaft helps decrease
inertial mass by 20%, reducing friction for faster-revving
low-rpm response.
- New-design piston features shorter skirt and
smaller pin boss diameter to help reduce weight.
- Shorter, lighter-weight titanium valves and
load-reduced springs are nearly 20% lighter, further reducing
reciprocating mass for faster-revving, harder-hitting
power delivery across the rev range.
- Additional weight-reducing engine upgrades
include: smaller-design cam chain tensioner and oil pump;
aluminum oil hose (was steel); all-titanium exhaust header,
flange, bracket and heat shield; and lighter CDI ignition
unit, coil ad magnet rotor.
- Improved carburetor features throttle cover
with excellent sealing and all-new hot start system with
convenient, handlebar-mounted lever.
- All-new automatic compression system eliminates
manual lever, ensuring easy restarts in any gear.
- Redesigned airbox features all-new retaining
bracket for improved sealing.
- All-new, smooth-shifting 4-speed transmission
sheds one gear to help reduce weight, while revised 1st,
2nd and 4th gear ratios delivers new engine's potent powerband
to the ground with maximum efficiency and hook-up.
- Super-strong frame redesigned with reduced
weight and greater lateral rigidity for minimal flex and
razor-sharp handling.
- All-new tapered swingarm features less weight
and greaterrigidity for more compliant rear suspension
action.
- Recalibrated front fork settings deliver improved
damping force with less bottoming for a smoother, more
compliant overall stroke.
- Rear shock refinements include improved actuation,
a new linking ratio and enhanced damping force.
- Removable aluminum rear subframe redesigne,
reduces weight and allows for easy maintenance.
- All-new, lighter-weight front and rear master
cylinders and calipers, combined with 250mm fully floating
front and 245mm rear disc, deliver stronger stopping power
with greater, more progressive control and feel.
- Retooled steering crown combines with all-new
bodywork - flatter seat, fuel tank and radiator shrouds
- creates a more aggressive riding position while allowing
optimal rider movement.
- More weight savings come via all-new, two-piece
(part aluminum, part plastic) engine protector plates
and thinner-walled engine guard construction.
Engine
- 39mm Keihin FCR flat-slide carburetor with
throttle position sensor (TPS) delivers ultra-precise
fuel/air mixing and instant throttle response.
- Digital CD ignition system delivers ultra-precise
spark and timing for faster, stronger engine response
during hard acceleration, and less kickback during starting.
- Large-capacity radiator provides outstanding
cooling efficiency.
- Primary kickstarting (with all-new automatic
decompression and hot start lever) ensures easy restarts.
- Trick, works-style clutch lever features oversize
barrel adjuster for easy, on-the-fly adjustability of
lever/cable play.
Chassis/Suspension
- Removable aluminum rear subframe constructed
of square-section pipe for reduced weight.
- Lightweight 46mm inverted Kayaba cartridge
fork features 11.8" of travel and compression and rebound
damping adjustability.
- Low-friction outer tubes and aluminum piston
rods ensure smooth, compliant fork stroke and light steering.
- Rear suspension system features fully adjustable
Kayaba shock with 12.4" of travel and separate adjusters
for high- and low-speed compression damping.
- Lightweight front wheel hub reduces unsprung
weight and increases durability.
- Premium Dunlop 739 knobbies offer unbeatable,
competition-spec traction and excellent wear.
- Lightweight 21" front and 19" rear Excel rims
are exceptionally durable and reduce unsprung weight.
Additional Features
- Wide, cleated, folding cast alloy footpegs
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.
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