2014 honda crf450r

2014 honda crf450r
Press information for CRF450R 2014
2014 HONDA CRF450R
Press release date:
Model updates: Honda’s flagship Motocrosser receives engine development – for
greater torque, throttle feel, top-end power and over-rev –plus upgrades to the 48mm
KYB air front fork.
Contents:
1 Introduction
2 Model overview
3 Key features
4 Technical specifications
1. Introduction
Matching an agile state-of-the-art chassis to big-hitting four-stroke power and torque,
since its introduction in 2002 the Honda CRF450R has proven itself a complete,
winning package for the professional Motocross racer while its reliability, longevity
and build quality have also made it a popular machine for the amateur racer and
hobby rider alike.
The 2013 model year CRF450R featured a brand new mass-centralised frame built
around KYB air suspension USD front forks, a major evolution focused on assisting
the rider to turn in super-fast lap times with less effort, on the ground and whilst
airborne. It fought off stiff competition to become the best-selling open-class MX bike
in Europe and, packed with a host of detail upgrades from HRC, the 2014 CRF450R
builds on its abilities and success.
Press information for CRF450R 2014
2. Model Overview
Delivering improved bottom-end torque, the CRF450R’s 449cm3 single-cylinder
engine benefits from new Dual Fuel injection timing and updated twin rear silencers
while the clutch features lighter springs – with no loss of durability. These
modifications are aimed at providing a direct, yet sensitive connection to the rear tyre
enhancing rear wheel traction and drive plus the rider’s feel for available grip. Work
on the intake and exhaust ports by the CRF450R’s development engineers has also
produced improved over-rev and power at peak rpm.
The sixth generation aluminium twin-beam frame remains unchanged for 2014, as do
the aluminium swingarm and Pro-Link rear suspension linkage. Rebound and
compression damping have been refined on the company KYB rear shock, and the
48mm KYB front forks receive revised internals for improved damping response. The
CRF450R’s crisp styling – combining stark form with brutal function – allows the rider
complete freedom to move intuitively and the Extreme Red and White graphic design
underlines the Honda racing lineage.
3. Key Features
3.1 Engine
The CRF450R’s liquid-cooled, four-valve Unicam engine’s bore and stroke is set at
96mm x 62.1mm with 36mm inlet valves and 31mm exhaust valves. Both inlet and
exhaust ports have been redesigned and reshaped to improve gas flow and
combustion efficiency, complemented by the new PGM-FI Dual Fuel injection timing
that delivers sensitive feel for power and torque at partial throttle openings. The
throttle body diameter is 46mm and compression ratio is 12.5:1.
Shot-peening the piston skirt with molybdenum disulfide reduces friction while the
piston oil jet uses two holes instead of one, for improved cooling of its underside.
Modulating power and torque, the six-spring clutch features new springs for a lighter
lever action with no loss of capacity or durability. The five-speed close-ratio gearbox
is unchanged.
The short rhombohedral twin rear silencers – another key part of the mass
centralization process – feature new internals; the left/right junction area has been
optimized to improve the balance and flow of exhaust gas and back pressure.
Overall, the CRF450R’s new engine specification delivers in three key areas:
improved bottom-end torque for punching out of corners, finer feel at partial throttle
openings to control drive and manage the available traction and greater top-end
power and over-rev, for instant high-rpm snap and the ability to hold a given gear for
longer.
3.2 Chassis
The 9.35kg aluminium twin-beam frame was designed from the outset around the
48mm KYB air suspension front fork, building on the improved suspension
performance to deliver superb front tyre side-grip. Full mass-centralisation – and the
Press information for CRF450R 2014
the low centre of gravity – reduce physical inertia with improved high-speed stability.
Rake of 27.067°, with trail of 116mm and wheelbase of 1,492mm gives razor-sharp
turn-in and increased feel for available traction; all-up kerb weight is 111kg.
The KYB fork maintains its advantage over conventional steel springs, delivering
faster response in directional stroke transitions from compression to rebound, with
significantly less weight. For 2014 the KYB units receive revised rebound
pistons/centre rods plus new oil lock guides, for improved oil flow and damping
characteristics. In a sport where the most marginal gains matter, 25g weight has also
been shaved; stroke remains 310mm.
Fully adjustable for rebound and compression damping, preload is increased or
decreased via the Schrader air valve fitted on the top of the fork cap. Standard
pressure is 230kPa (33psi), minimum pressure is 220kPa (32psi) and maximum
pressure is 250kPa (36psi). The CRF450R can also be tied down for transport simply
by removing air pressure, lowering the front end with no risk of damaging fork seals.
The aluminum swingarm provides massive rigidity for less deflection in ruts, and
improved corner-exit traction. It works a compact, fully adjustable (spring preload and
rebound damping, plus high and low speed compression damping) KYB rear shock;
the benefit of mass centralization in this area is reduced pitching inertia along the
bike’s centre line – harder braking is possible with improved stability. The shock’s
stroke is set at 133.5mm, allowing 315mm axle travel.
Clever packaging of equipment around the frame contributes to mass centralization;
all of the electrical components – ECU, condenser, regulator and wiring harness –
are lightweight and centrally located below the throttle body.
The 2014 CRF450R’s bodywork maintains the ‘triangle proportion’ that has long set
the CRF family of competition machines apart. A phrase used by Honda’s engineers
during initial development of the 2013 model was ‘man maximum, mechanical
minimum’. Essentially the machine is built about human needs, the rider, first and
foremost and mass centralization plus enhanced ergonomics are at the heart of the
CRF450R’s shape.
In support of this the shrouds, side covers, seat and fuel tank offer a slim, smooth
and continuous transition allowing the rider a great deal of freedom and flexibility of
movement. The radiator shrouds incorporate high-efficiency channels for maximum
airflow into, through and out of the compact radiators; fuel capacity is 6.4 litres.
The front disc cover is designed in two parts, for easier maintenance of the 240mm
wave-pattern disc and twin-piston brake caliper. The rear brake is a 240mm wavepattern disc with single-piston caliper. Both calipers use sintered metal brake pads.
Lightweight aluminium rims, with directly attached spoke pattern layout reduce
unsprung weight; front wheel size is 21 x 1.6in and 80/100-21 tyre, the rear is 19 x
2.5in and 110-90/19 tyre.
Press information for CRF450R 2014
4. Technical Specifications
ENGINE
Type
4 stroke, single cylinder, uni-cam
Displacement
449.7cc
Bore Stroke
96.0mm x 62.1mm
Compression Ratio
12.5:1
FUEL SYSTEM
Carburation
FI
Fuel Tank Capacity
6.4L
ELECTRICAL SYSTEM
Ignition System
Full transistor
Starter
Kick
DRIVETRAIN
Clutch Type
Multi plate wet clutch
Transmission Type
5 speed, constant mesh
Final Drive
Chain
FRAME
Type
Aluminium twin tube
Press information for CRF450R 2014
CHASSIS
Dimensions
(LWH)
2191mm x 827mm x 1271mm
Wheelbase
1,492mm
Caster Angle
27°
Trail
116mm
Seat Height
953mm
Ground Clearance
330mm
Kerb Weight
111kg
SUSPENSION
Type
Front
48mm inverted Air Fork, 310mm
stroke, fully adjustable
Rear
Pro-link, Fully adjustable mono
shock, 133.5 mm stroke, 315mm
axle travel
WHEELS
Type
Tyres
Front
Wire spoke
Rear
Wire spoke
Front
80/100-21
Rear
120/80-19
Front
240mm Hydraulic disc
Rear
240mm Hydraulic disc
BRAKES
Type
Press information for CRF450R 2014
All specifications are provisional and subject to change without notice.
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