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.
Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation.
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.
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.
Rear shock damper piston diameter is 50 mm for consistent performance under demanding riding conditions.
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.
Forged 12:1-compression slipper piston is lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power.
Nikasil cylinder lining is lightweight and provides cooler and quieter operation for extended engine life.
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 315 mm (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 313 mm (12.3 inches) of wheel travel, separate low-speed (13 positions) and high-speed (3.5 turns) compression damping adjusters, and 17-position rebound damping adjustment.
Wide-ratio five-speed transmission
Final Drive : #520 T-ring-sealed chain; 13T/51T
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.
Powerful 4-stroke 449 cc liquid-cooled four-valve Unicam engine is designed to produce power across a wide rpm band. Unicam valve train provides the lightweight of a compact single-cam design and the optimum combustion chamber shape for maximum power.
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 rocker-arm. Lightweight titanium intake valves permit use of smaller valve springs, reducing overall engine height. Clutch cover and cylinder head cover are made of magnesium to reduce engine weight.
Neatly tucked away behind the front number plate, the Honda Progressive Steering Damper (HPSD) makes a huge difference in your ability to hold the line in corners. Rebuildable, and with up to 15 clicks of adjustment, HPSD also allowed engineers to reduce steering offset and shorten wheelbase for an amazingly nimble feel. You get the best of both worlds: improved manoeuvrability, and uncanny cornering control. The aluminum frame design is matched to rider ergonomics to maximize handling and control.
Semi-double-cradle twin-spar aluminum frame 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. In addition, tall swingarm pivot plates and narrow frame spars create a narrow overall frame cross-section for superb rider comfort and manoeuvrability.
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 the same lightweight rear hub and HRC works-type lightweight aluminum spoke nipples as used on CRF450R.
Compact twin-piston front brake caliper, anodized aluminum brake pistons and lightweight front brake disc minimize unsprung weight for improved turning and handling. 240 mm wave-style front and rear brake rotors reduce unsprung weight.