2005 Honda CRF450R
Leading the 4-stroke revolution with its berm-busting motocross performance, the
blazing CRF450R has been commanding more than its share of podium finishes since
its introduction. Featuring a roost-raising power delivery, light, rigid and quick-handling
aluminium frame, and supple Works racer suspension systems, the CRF450R enters
2005 with a wealth of refinements and lighter weight that make this big 4-stroke the
overwhelming class favourite and one of the best-handling dirt trackers you'll find
anywhere.
Colours
Extreme Red (with White number plate and sidecovers)
New Features
New 4th-generation twin-spar aluminium frame features forged aluminium steering
head and tapered downtube section designed for optimised frame rigidity. Tall
swingarm pivot plates and thin frame spars create a narrow overall frame cross-section
for superb rider comfort and manoeuvrability.
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 aluminium steering head provides a compact and extremely durable mount for
the frame spars and engine downtube.
New swingarm features slimmed down dual-axis, double-taper design with large cast
aluminium cross-member for a lighter, stronger and more rigid design.
New shift drum, shift forks and shift fork shafts for smoother and more precise
shifting.
New front and rear suspension valving for improved bump absorption.
New front axle placement for improved fork action and turning.
New Pro-Link ratio combines with 5.5kg rear damper spring for more compliant
suspension operation.
New exhaust pipe heat shield made from titanium for weight savings.
New airbox and intake tube for more direct airflow and increased power.
New side number plate with built-in airbox vents for improved air flow.
New aluminium clutch cable bracket for lighter weight.
New rear wheel hub is stronger and lighter.
New one-piece seat bolt for easier maintenance.
New lighter rear brake pedal.
New rear brake pad insulators for consistent braking action.
New narrower 3-core radiators for improved rider ergonomics while maintaining
cooling capacity.
New radiator hose routing for lighter weight and improved cooling.
Overall weight reduced by 1.2kg.
Engine/Drivetrain
Powerful 4-stroke 4-valve Unicam engine churns out 41kW of power at 9,000min-1
and 50Nm of torque at 6,500min-1. Power is produced across a wide rpm-band for easyto-
control operation.
Auto decompression and hot restart system make starting easy in all conditions.
Liquid-cooled 449cm³ Unicam engine pumps out nearly 90kW per litre while
maintaining Honda's legendary simplicity and dependability.
Compact, lightweight engine assembly weighs only 29kg.
ACG cover made from magnesium for reduced heat build-up and lighter weight.
Unique Unicam valve train provides both the light weight of a compact single-cam
drive and an optimum combustion chamber shape for maximum power at all engine
speeds.
Unicam valve train features a single carburised camshaft directly actuating two 36mm
titanium intake valves from above. The camshaft's centre exhaust lobe actuates two
31mm steel exhaust valves via a forked, low-friction, roller rocker arm. A separate cam
holder contributes to the compact design, which allows a remarkable 21.5° included
valve angle while saving weight over comparable DOHC systems.
Lightweight titanium intake valves permit use of smaller valve springs, reducing
overall engine height and saving 15.2g per valve compared to conventional steel valve
designs.
Unique, internal pin-rotation-type auto decompressor realises a compact and
lightweight system that provides superb cold-starting and hot-restarting operation.
High-strength, low-carbon steel crankshaft with carburised main journals for
maximum durability at sustained high-rpm operation.
Forged 12 : 1 compression slipper piston is 130g lighter than conventional designs, for
quick-revving response while maintaining excellent cylinder sealing and high-rpm
power.
Double-carburised connecting rod utilises big-end needle bearing for maximum highrpm
performance and durability.
Lightweight NiCaSil cylinder lining ensures cooler and quieter operation for extended
engine life.
Press-fitted aluminium spark plug pipe fits between forked exhaust rocker arms,
further contributing to compact cylinder head design.
40mm FCR-type carburettor features four rollers on the flat slide, resulting in light
throttle effort, smooth operation, crisp throttle response and excellent rideability.
Bottom of float chamber designed to allow more fuel to pass to the main jet.
Fully electronic Capacitor Discharge Ignition (CDI) features 8-bit digital CPU for
instant data calculation and highly accurate ignition that ensures maximum performance.
Twin-sump lubrication system separates oil supply to crankshaft, piston and valve
train from supply to clutch and transmission. This ensures a steady supply of cool oil to
the clutch, eliminates clutch and transmission material contamination of the engine oil,
and reduces the amount of circulating oil along with the oil pump size.
Vertically split crankcases feature built-in oil pump, reducing weight by 145g
compared to conventional designs.
Gear-driven balancer reduces vibration while also driving the water pump.
Eight-plate clutch provides ample surface area to handle the engine's massive torque,
while carefully matched clutch springs provide a light feel at the lever.
Exhaust system uses lightweight titanium exhaust header and repackable aluminium
muffler with stainless steel pipe. Silencer packing is also long-lasting.
Dual radiators provide significantly more surface area and more effective heat
dissipation compared to single-radiator designs.
Chassis/Suspension
Aluminium frame design matched to rider ergonomics for optimised handling and
control operation.
Front and rear wheels feature HRC Works-type lightweight aluminium spoke nipples
for reduced unsprung weight.
Front wheel features large-diameter front axle and wide wheel-bearing span for
excellent rigidity.
Rear axle diameter of 25mm and large-diameter bearings provide significant rigidity
and strength to withstand torturous track conditions.
Lightweight, 47mm Showa inverted twin-chamber cartridge-type fork with aluminium
dampers features unique CRF settings. Fork offers 315mm of travel and 16-step
rebound and compression damping adjustability. Front fork outer stanchion tubes
receive same inner surface honing treatment as Works bikes for low-friction operation.
Single-shock Pro-Link rear suspension system features fully adjustable Showa rear
damper and 319mm of wheel travel, separate low-speed (13-step) and high-speed (3.5
turns) compression damping adjusters and 17-step rebound damping.
Large 50mm rear damper piston diameter provides consistent performance under
demanding riding conditions.
Large, 240mm front and rear brake discs.
Compact dual-piston front brake calliper designed for over 30g in weight savings over
conventional types. Anodised aluminium brake pistons and lightweight front brake rotor
further minimise unsprung weight for improved turning and handling.
HRC Works-type rear brake system integrates the rear master cylinder and fluid
reservoir, eliminating conventional external reservoir and hose.
Additional Features
Frame design allows larger air-intake ducts in sidecovers, contributing to significantly improved airflow in the mid- and upper-rpm range.
Rider ergonomics optimised by adapting handlebar, seat and footpeg height at the
narrowest cross-section of the frame, for improved comfort and handling feel.
Seat cushion follows the shape of the fuel tank, providing a smooth transition to
increase rider mobility and comfort.
Non-slip seat cover enhances rider control.
Brake pedal and shift lever designed to complement the riding position. Brake pedal
features optimised ratio to match integrated rear-brake master cylinder design.
Wide, cleated stainless steel footpegs are self-cleaning, corrosion-resistant, provide
excellent grip and fold for extra ground clearance.
Cleated rear brake pedal and shift lever made of lightweight aluminium.
Adjustable front brake lever for maximum control.
Quick-adjust clutch perch for easy cable adjustment.
Standard equipment aluminium 971 bend Renthal handlebars rubber-mounted to
reduce rider fatigue and improve comfort.
CR handlebar holders provide three different mounting positions: standard CRF450R
holder (CR125R-type) provides +/- 3mm fore or aft position to match rider preference,
and optional holder (CR250R-type) provides neutral position.
Works-type handlebar grips add to rider comfort.
Front disc brake cover helps protect rotor and calliper from damage.
Removable rear sub-frame allows easy maintenance.
Washable, two-stage foam air filter for optimal engine protection and easy
maintenance.
Re-packable silencer for maximum performance and minimal noise.
Comfortable, durable controls and high-quality fasteners.
Stainless steel clutch cable for long-life operation.
Honda Racing-inspired colours and graphics.
Specifications
Engine Type - Liquid-cooled 4-stroke 4-valve SOHC single
Displacement - 449cm³
Bore x Stroke - 96 x 62.1mm
Compression Ratio - 12 : 1
Max. Power Output - 41.5kW/9,000min-1 (95/1/EC)
Max. Torque - 50.7Nm/8,500min-1 (95/1/EC)
Carburation - 40mm Keihin FCR flat-slide carburettor
Ignition System - Computer-controlled digital capacitor discharge with
electronic advance
Starter - Primary kick
Transmission - 5-speed
Primary Reduction - 2.739 (63/23)
Gear Ratios - 1 1.800 (27/15), 2 1.470 (25/17), 3 1.235 (21/17), 4 1.050 (21/20), 5 0.909 (20/22)
Final Reduction - 3.692 (48/13)
Final Drive - #520 roller chain
Frame - Semi-double cradle; aluminium twin-spar
Dimensions - (LxWxH) 2,186 x ?825 x ?1,254mm
Wheelbase - 1,491mm
Caster - 27° 47'
Trail - 109.4mm
Seat Height - 955mm
Ground Clearance - 339mm
Fuel Tank Capacity - 7.2 litres
Dry Weight - 99.7kg
Kerb Weight - 108.9kg
Suspension - Front, 47mm Showa inverted leading-axle twin-chamber cartridge-type telescopic fork with 16-step adjustable compression and rebound damping; 315mm axle travel,
Rear - Pro-Link with Showa damper, adjustable low-speed (13-step) & high-speed (3.5-turn) compression and 17-step rebound damping; 320mm axle travel
Wheels - Front, 21 x 1.60 aluminium rim/wire spoke, Rear - 19 x 2.15 aluminium rim/wire spoke
Tyres - Front, 80/100-21 51M, Rear - 110/90-19 62M
Brakes - Front, 240mm hydraulic disc with dual-piston calliper and
sintered metal pads, Rear - 240mm hydraulic disc with single-piston calliper and
sintered metal pads
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