2007 Honda CRF™450X

Additional Features:

• All plastic body components (radiator shroud, side covers, rear fender, seat base, fuel tank, front fender and front headlight) are designed for slimmer, more aggressive styling and lighter weight.
• Airbox features easy access to reusable foam air filter.
• Rider ergonomics are optimized by adapting the handlebar, seat and footpeg height to place the rider's legs at the narrowest cross-section of the frame for improved comfort and handling feel.
• Seat cushion uses foam construction that follows the shape of the fuel tank, providing a smooth transition to increase rider mobility and comfort.
• "Non-slip" seat cover for increased rider control.
• Rear-brake pedal and shift lever are made of lightweight aluminum and are designed to complement the riding position. Brake pedal features optimized ratio to match integrated rear-brake master cylinder design.
• Wide, cleated, stainless steel footpegs are self-cleaning, resist corrosion, provide excellent grip and fold for extra ground clearance.
• Aluminum Renthal handlebar (971 bend) is rubber-mounted to reduce rider fatigue and improve comfort.
• CR® handlebar holders provide three different mounting positions: standard CRF450X holder (CRF450R/ CR125R /CRF250R-type) provides +/- 3 mm fore or aft position to match rider preference, and optional holder (CR250R-type) provides neutral position.
• Works-type handlebar grips add to rider comfort.
• Adjustable front brake lever.
• Hot-start lever conveniently located on clutch perch.
• Quick-adjust clutch perch.
• Chain guide material offers durable wear resistance, and service life is five times greater than conventional materials.
• Front disc brake cover helps protect rotor and caliper from damage.
• Removable rear subframe allows for easy maintenance.
• Washable, two-stage foam air filter for optimal engine protection and easy maintenance.
• Comfortable, durable controls and high-quality fasteners.
• Stainless steel clutch cable for long life.
• Honda Racing™-inspired colors and graphics.

Chassis / Suspension:

• Fourth-generation twin-spar aluminum frame. Forged-aluminum steering head and tapered downtube section are designed to optimize frame rigidity. In addition, tall swingarm pivot plates and narrow frame spars create a narrow overall frame cross-section for superb rider comfort and maneuverability.
• Semi-double-cradle frame design features a single, large-diameter tapered downtube. Two rugged box-section rails attach to the base of the downtube and support the engine. A forged-aluminum steering head provides a compact and extremely durable mount for the frame spars and engine downtube.
• The aluminum frame design is matched to rider ergonomics to maximize handling and control operation.
• Swingarm features a dual-axis, double-taper design with a large cast-aluminum cross-member offering high strength and light weight.
• 18-inch rear wheel features same lightweight rear hub and HRC works-type lightweight aluminum spoke nipples as used on CRF®450R.
• Front wheel features large-diameter front axle and wide wheel-bearing span for excellent rigidity.
• Rear-axle diameter of 25 mm and large-diameter bearings provide optimum rigidity to withstand torturous off-road conditions.
• Lightweight 47 mm inverted Showa twin-chamber cartridge fork with aluminum dampers is derived from the CRF450R and features settings unique to the CRF450X. The fork offers 12.4 inches of travel, 16-position rebound and 16-position compression damping adjustability. The inner surface of the front fork outer-tubes receives the same honing treatment as works bikes for low-friction operation.
• Pro-Link® single-shock rear suspension system features a fully adjustable Showa rear damper and 12.4 inches of wheel travel, separate low-speed (13 positions) and high-speed (3.5 turns) compression damping adjusters and 17-position rebound damping.
• Rear shock damper piston diameter is 50 mm for consistent performance under demanding riding conditions.
• Compact twin-piston front brake caliper, anodized aluminum brake pistons and lightweight front brake disc minimize unsprung weight for improved turning and handling.
• HRC works-type rear brake system integrates the rear master cylinder and fluid reservoir, eliminating the need for a remote master cylinder reservoir and hose assembly.
• 240 mm front and rear brake discs.

Engine / Drivetrain:

• Powerful four-stroke 449 cc liquid-cooled four-valve Unicam® engine is designed to produce power across a wide rpm band for off-road riding.
• Electric starter drives the clutch side of the crankshaft to provide superior lubrication of starter gears, and produce a narrow engine with a short, strong crankshaft.
• Lightweight, compact, internal auto decompressor system provides superb cold-starting and hot-starting operation.
• Compact, lightweight engine assembly weighs only 71 pounds.
• Unicam valve train provides the light weight of a compact single-cam design and the optimum combustion chamber shape for maximum power at all engine rpm.
• Unicam valve train features a carburized single camshaft that directly actuates two 35 mm titanium intake valves. The camshaft exhaust lobe actuates two 30 mm steel exhaust valves via a forked, low-friction roller rockerarm.
• Lightweight titanium intake valves permit use of smaller valve springs, reducing overall engine height.
• Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation.
• Clutch cover and cylinder-head cover are made of magnesium to reduce engine weight.
• Forged 12.0:1 compression slipper piston is lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power.
• Double-carburized connecting rod utilizes an updated big-end needle bearing and thrust washers for maximum high-rpm performance and durability.
• Nikasil cylinder lining is lightweight and provides cooler and quieter operation for extended engine life.
• Press-fitted aluminum spark-plug pipe fits between forked exhaust rocker arms, further contributing to compact cylinder-head design.
• 40 mm Keihin FCR-type carburetor features four rollers on the flat slide, resulting in very light throttle effort, smooth operation, crisp throttle response and excellent rideability.
• Carburetor features a throttle position sensor (TPS) that helps maintain linear throttle response throughout the rpm range.
• Twin-sump lubrication system separates the oil supply for the crankshaft, piston and valve train from the clutch and transmission. This ensures a cool supply of oil to the clutch, eliminates clutch and transmission material contamination of the engine oil, reduces the amount of circulating oil and permits the use of a smaller oil pump.
• Vertically split crankcases feature a built-in oil pump, reducing weight compared to a conventional design.
• Exhaust system uses a lightweight, stainless steel exhaust header and muffler equipped with spark arrester.
• Dual radiators feature a refined core area for improved heat dissipation compared to conventional dual-radiator design. Coolant recovery tank is located in front of the engine between the frame down-tubes for improved center of gravity. Coolant tank is protected by plastic skid-plate.
• Gear-driven balancer reduces vibration and drives the water pump. Eight clutch plates provide the surface area necessary to handle the engine's massive torque, while carefully matched clutch springs provide a light feel at the lever.
• T-ring-sealed chain is approximately 1.6 mm narrower, and stronger compared to conventional chains.
• Durable and versatile five-speed wide-ratio transmission.

New for 2007:

• New one-piece cover protects throttle cable by keeping out dirt and water.
• Carburetor features new accelerator pump and linkage for improved throttle response.
• Lighter rear chain guide.

Unique Features:

• Electric-start system for easy starting in all conditions.
• Fuel-tank capacity is 2.27 gallons.
• Resettable, easy-to-read three-digit odometer.
• USDA-qualified muffler / spark arrester.
• Powerful 35W halogen headlight offers a wide range of illumination.
• Integrated LED taillight in rear fender.
• Convenient sidestand integrated into left footpeg bracket can be easily removed for competition events.
• Easy-access air filter.
• Wide-ratio five-speed transmission.
• Suspension and chassis tuned for competitive off-road riding needs.
• 18-inch rear wheel for greater flat-tire protection.
• T-ring-sealed chain is narrower, stronger and lighter compared to conventional O-ring chains.
• Skid-plate and engine guards feature a unique three-piece design.