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New for 2006 |
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All-new engine is closely related to the CRF®450R and CRF450X. |
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Kick start model (TRX 450R) available for easy starting in all conditions. |
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Maximum engine rpm is 9850. |
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New 40mm Keihin FCR-type carburettor for improved engine response. |
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Forged slipper piston is lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power. |
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Compression ratio increased from 10.5:1 to 12.0:1. |
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New transmission ratios designed for racing applications and trail use. |
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Longer swingarm and new linkage ratio for improved turning. |
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New A-arms, knuckles and spindles for improved turning. |
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Stronger hubs provide improved rigidity. |
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8mm lower riding position for lower centre-of-gravity, improved handling and rider feel. |
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Front suspension is lighter and features a new spring for improved bump absorption. |
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Rear suspension is lighter for improved handling and travel has been increased from 229mm to 236 mm. |
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New airbox for improved airflow and increased power. |
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Air filter is 1.4 times larger than previous unit for improved airflow and power. |
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New exhaust system and free-flowing muffler increase performance while maintaining low noise levels. |
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New cylinder head porting features improved flow for maximum performance. |
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Lighter radiator features revised fin pitch for increased airflow. |
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New headlight shape for race-derived look. |
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Engine/Drivetrain |
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Powerful four-stroke 450cc liquid-cooled four-valve Unicam® engine is based on the award-winning CRF450R motocross and CRF450X off-road engines. |
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Compact, lightweight engine designed specifically for ATV usage is worthy of its CRF heritage. |
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Unicam valve train provides the light weight of a compact single-cam drive and the optimum combustion chamber shape for maximum power at all engine rpm. |
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Unicam valve train features a carburized single camshaft that directly actuates two 36mm titanium intake valves. The camshaft exhaust lobe actuates two 30mm steel exhaust valves via a forked, low-friction roller rocker-arm. |
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Lightweight, compact, internal auto decompressor provides superb cold-starting and hot-starting operation. |
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Kickstart version incorporates ATV-type forward kickstarting for ease of starting and light weight. |
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Crankshaft is made of high-strength, low-carbon steel with carburized main journals for maximum durability at sustained high-rpm operation. |
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Cylinder head cover is made of magnesium to reduce engine weight. |
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Forged three ring 12.0:1 compression slipper piston is lighter than a conventional design, revving quickly while maintaining excellent cylinder sealing and high-rpm power. |
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Double-carburized connecting rod utilizes a big-end needle bearing for maximum high-rpm performance and durability. |
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Nikasil cylinder lining is lightweight and provides cooler and quieter operation for extended engine life. |
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Press-fitted steel spark plug pipe fits between forked exhaust rocker arms, further contributing to compact cylinder head design. |
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40mm Keihin FCR-type carburettor features four rollers on the flat slide, resulting in very light throttle effort, smooth operation, crisp throttle response and excellent rideability. |
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Carburettor features a throttle position sensor (TPS) that helps maintain linear response throughout the rpm range. |
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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 to the engine oil, and reduces the amount of circulating oil a |
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Vertically split crankcases feature a built-in oil pump, reducing weight compared to a conventional design. |
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Left side countershaft bearing and axle carrier feature double-row bearings for added durability. |
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Exhaust system uses a lightweight stainless steel header and muffler. |
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Radiator is lighter weight and has revised fin pitch for improved air flow in all riding conditions. |
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Compact, flat radiator fan is lightweight and provides efficient cooling. |
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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. |
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Durable five-speed transmission with all-new lower ratios designed to match new engine power characteristics. |
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Chassis/Suspension |
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New rider's position features 8mm lower handlebar, seat and footpegs for improved centre of gravity and rider feel. |
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Round-tube steel frame with removable aluminium subframe is lightweight and durable. |
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One-piece cast aluminium swingarm for light weight, maximum strength and durability. |
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Independent double-wishbone front suspension with fully adjustable Showa shocks provides 213mm of travel, and features rear-facing reservoirs for increased durability. |
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Pro-Link® rear suspension with fully adjustable Showa piggyback shock provides 236 mm of travel. |
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Dual 174mm front disc brakes with twin-piston callipers and new high-pressure front brake lines provide excellent stopping power. |
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190mm rear disc and beefy single-piston calliper provide improved stopping power and increased ground clearance. |
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Aluminium brake callipers and brackets front and rear reduce weight. |
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Removable aluminium rear grabrail and front bumper for reduced weight. |
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Lightweight aluminium wheels reduce unsprung weight for outstanding handling. |
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Dunlop radial tires provide superb traction and cornering ability. |
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Durable and lightweight O-ring-sealed drive chain. |
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Additional Features |
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Throttle lever and carburettor feature full-closed detection system. |
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Convenient oil-level window allows for at-a-glance oil check. |
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Long, narrow seat is designed for superior comfort and performance in all operating conditions. Saddle is also easy to remove for convenient access to the air filter. |
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Adjustable dual headlights with 30-watt bulbs and improved reflectors for excellent visibility and distinctive appearance. |
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Pivot-access brake callipers for easy pad replacement. |
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Engine cases protected by high-impact plastic skidplate. |
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LED tail/brake light for light weight and aggressive appearance. |
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CRF-style clutch and front brake lever. |
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Wide footpegs for improved rider control. |
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Aluminium shift and brake pedals. |
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CRF-type handlebar grips. |
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Honda Racing-inspired colours and graphics. |
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Optional HRC Racing Kit available. |