2006 Honda CRF450R
The choice of motocross, off-road, flattrack and Supermoto riders everywhere,
Honda's race-winning CRF450R receives a host of refinements in 2006 to extend its
dominance. Its roost-raising power delivery, light, rigid and quick-handling aluminium
frame, and supple Works racer suspension systems combine with a wealth of refinements
and quieter operation to 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)
Features and Benefits;
New Features;
Engine relocated 5mm forward and 5mm lower for improved turning and
manoeuvrability.
Engine placement lowers centre of gravity for improved weight feel.
New intake valve seat material improves valve durability.
New carburettor needle for improved engine response.
Newly designed water pump impeller increases water pump seal life.
New exhaust system placement improves mass centralisation.
Exhaust system sound output meets the FIM's new 96 decibel noise regulations.
Radiators are mounted 5mm lower for lower centre of gravity and improved weight
feel.
New front fork outer stanchion tubes for lighter weight.
New front and rear suspension valving for improved bump absorption.
New front hub is lighter and stronger.
Engine/Drivetrain;
Powerful 4-stroke 4-valve Unicam engine churns out 40.5kW of power at 9,000rpm
and 50Nm of torque at 7,000rpm. 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
high-rpm 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 features lightweight titanium exhaust header and heat shield.
Repackable aluminium silencer features stainless steel pipe and long-lasting silencer
packing.
Narrow dual radiators provide significantly more surface area and more effective
heat dissipation compared to single-radiator designs.
Chassis/Suspension;
Fourth-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.
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 sidecovers to have larger air-intake ducts, contributing to
significant air flow increase in the mid- and upper-rpm ranges.
Rider ergonomics are optimised 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 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 Renthal 971 bend aluminium 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.
Technical Specifications - CRF450R (ED-type);
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 - 40.5kW/9,000min-1 (95/1/EC)
Max. Torque - 50.2Nm/7,000min-1 (95/1/EC)
Fuel System;
Carburation - 40mm Keihin FCR flat-slide carburettor
Fuel Tank Capacity - 7.2 litres
Electrical System;
Ignition System - Computer-controlled digital capacitor discharge with
electronic advance
Starter - Primary kick
Drivetrain;
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 Type - Semi-double cradle; aluminium twin-spar
Chassis;
Dimensions - (LxWxH) 2,191 x 825 x 1,262mm
Wheelbase - 1,491mm
Caster - 26° 47'
Trail - 109.4mm
Seat Height- 955mm
Ground Clearance - 339mm
Dry Weight - 99.7kg
Kerb Weight - 108.9kg
Suspension;
Type - Front, 47mm Showa inverted leading-axle twin-chamber cartridgetype
telescopic fork with 16-step adjustable compression and
rebound damping; 315mm axle travel
Rear - Pro-Link with Showa damper, adjustable low-speed (13-step)
and high-speed (3.5-turn) compression and 17-step rebound
damping; 320mm axle travel
Wheels;
Type - Front, Aluminium rim/wire spoke
Rear - Aluminium rim/wire spoke
Rim Size - Front, 21 x 1.60
Rear - 19 x 2.15
Tyres - Front, 80/100-21 51M
Rear - 110/90-19 62M
Brakes;
Type - Front, 240mm hydraulic disc with dual-piston calliper and sintered
metal pads
Rear - 240mm hydraulic disc with single-piston calliper and sintered
metal pads
All specifications are provisional and subject to change without notice.
|
