Ultra-powerful 449cc Liquid-cooled, Four-stroke Single
- 449cc liquid-cooled, four-stroke single with four valves
- Features improved low and mid-range power delivery for climbing hills, riding in the mud or other poor-traction, low-speed conditions
- Linear power curve offers plenty of over-rev, for maximum flexibility in choosing shift points

Top End
- Revised cam lift and timing boost low- and mid-range torque
- Camshaft lobes and tappets feature a soft-nitride surface treatment for long wear and high-rpm reliability
- Hand-finished surfaces of the polished intake ports improve intake efficiency at all rpm
- Lightweight 36mm titanium intake valves and aluminum valve retainers reduce reciprocating weight for reliable valve control at high rpm
- 30mm steel exhaust valves replace the KX's 31mm titanium units for improved durability
- Double valve springs help ensure stable valve operation
- Screw-type automatic cam chain tensioner with oil pressure spring
- Revised ignition timing helps boost power
- Low-friction coating on piston skirt

Bottom End
- Flywheel mass is double that of the KX450F to provide ultra-smooth engine power characteristics
- Crankshaft, rotor mass centralization, oil circulation, and ignition timing have been carefully examined to help ensure ideal engine braking characteristics
- Crankshaft and connecting rod are sintered for additional rigidity

Exhaust
- Large 41mm titanium exhaust header for maximum power
- Tapered exhaust pipe joint helps increase ultra-low rpm power.
- Titanium exhaust pipe heat shield
- Silencer uses long-fiber packing for lower maintenance

Cooling
- High-capacity Denso radiators deliver superior cooling efficiency
- A reservoir tank is fitted to the radiator, for efficient cooling during long enduros
- Slim radiators feature tightly packed cores and fins designed to enhanced heat dispersion
- The KLX radiator shroud design is optimised for a seated position, compared to the KX shrouds

Electric Starting
- High-capacity starter motor is compact, yet offers high-output to help ensure quick and reliable starts under all conditions
- Lightweight battery is located beneath the seat and behind the airbox for optimum mass centralization
- Having both electric and kick starters means the KLX450 can be quickly restarted if the engine stalls during an event
- Features highly reliable auto-decompression system; the dual-weight centrifugal decompression system fitted to the exhaust cam eases starting, and its simple construction helps to ensure reliability

Wide-Ratio Five-Speed Transmission
- The wide-ratio 5-speed transmission features ratios specially for off-road racing
- The transmission's gears are designed for high durability
- Ball bearing shift lever for smoother shifting
- Ratchet-type shift mechanism for smoother shifting and a more positive feel

Frame
- Lightweight all-aluminum perimeter frame - straight from the KX450F - is a composite structure comprising forged, extruded and cast components
- The slim profile of the KLX450R frame, two-piece radiator shrouds that leave the upper frame spars exposed, and careful design of the remaining bodywork make the KLX450R feel light and narrow beneath the rider
- Aluminum skid plate

Front Suspension
- Fork tuning is optimized for light, easy handling characteristics
- Kayaba AOS (Air-Oil-Separate) fork keeps oil and air in separate chambers for stable damping performance during long motos
- Large front fork damper cartridges offer a more progressive and plush action
- Low-friction fork seals help reduce stiction

Rear Suspension
- New Uni-Trak(r) rear suspension system mounts the suspension arm below the swingarm, allowing a longer rear suspension stroke.
- The rear shock features dual compression adjustability, allowing high-speed and low-speed damping to be tuned separately
- Alloy swingarm uses cast front section, tapered hydroformed spars and forged chain pullers; the tapered spars are shaped to match the balance of flex and rigidity required of the aluminum frame.
- Sprocket style chain roller reduces drive lash

Brakes
- Like the KX450F, the KLX450R features petal brake discs front and rear. In addition to helping reduce unsprung weight, the wave shapes of the petal discs help clean the brake pads for more efficient braking performance

18??? Rear Wheel
- Durable 18??? rear wheel allows fitment of a wide selection of off-road tires

From the Cockpit
- Renthal aluminum handlebars are standard
- Lightweight short-length grips feature a special pattern to reduce vibration transmitted from the bars to the rider
- The seat is wider than the KX450F's for additional comfort during long enduros
- Seat uses a slip-resistant top surface for good grip when seated and smooth sides for excellent rider mobility

Off-road racing equipment
- Lightweight digital instrumentation includes a speedometer, twin tripmeter, odometer and clock
- Lightweight 2.1 gallon fuel tank is constructed to meet strict U.S. environmental regulations
- Gas tank petcock is fitted with a reserve
- Compact lighting package includes a 35 W headlight with lightweight plastic lens
- An ultra-compact and energy efficient LED tail lamp is used
- Side cover airbox holes have been eliminated to prevent the ingress of water. The left-side cover features a two-piece construction with a special ???door??? that allows easy access to the air cleaner
- Engine guards protect both sides of the engine. (KX450F has a right-side guard only.)
- Includes an aluminum skid plate for added protection from rocks and ledges
- A side stand is fitted as standard equipment
- California models feature a secondary air system to enable them to meet strict emissions regulations

Engine Type 4-Stroke, 1-Cyliinder, DOHC, Water-Cooled
Displacement 449 cc
Bore & Stroke 96.0 x 62.1 mm
Compression Ratio 12.0:1
Cooling Liquid
Carburetor Keihin FCR40
Ignition Digital AC-CDI
Starting Electric, with primary kick backup
Transmission Wide-ratio five-speed
Final Drive Sealed chain
Frame Semi Double Cradle
Rake/Trail 27.1''2/4.6 in.
Lubrication System Forced, semi-dry sump
Front Tire Size 80/100-21
Rear Tire Size 110/100-18
Front Suspension / wheel travel Telescopic Upside Down Fork / 12.0 in.
Rear Suspension / wheel travel New Uni-Trak Swingarm / 12.4 in.
Wheelbase 58.3 in.
Front Brake Type 225 mm Singel Disc
Rear Brake Type 215 mm Single Disc
Fuel Tank Capacity 2.11 gal.
Ground Clearance 12.6 in.
Seat Height 37.0 in.
Dry Weight 253.5 lb.
Overall Length 85.8 in.
Overall Width 32.3 in.
Overall Height 49.4 in.
Color Lime Green
Warranty 6 months
Good TimesTM Protection Plan 12, 24 or 36 months