2006 Honda CRF250R
Introduction;
The brilliant future of motocross arrives in the aggressive form of the high-flying
new CRF250R. With improved engine performance and a newly developed, masscentralised
dual silencer exhaust system contributing to sharper power delivery and
smoother, more responsive handling, the new CRF250R provides a potent blend of
quick-revving, race-bred 4-stroke performance that dominates the motocross circuit's
tight berms and big air jumps with confident ease.
The CRF's innovative, liquid-cooled 4-valve Unicam engine pumps out a wide
band of useable power with a strong thrust of low-end acceleration that leaps out of
corners. And its rugged, lightweight aluminium frame and fully optimised suspension
systems provide amazing control that smokes the competition right out of the box.
Racing never fails to improve the breed, and the CRF250R is a thoroughbred performer
with the gold to prove it.
Colours;
Extreme Red (with White number plate and sidecovers)
Features and Benefits;
New Features
New dual-muffler exhaust system centralises mass and reduces turning inertia to
improve the CRF250R's lightweight feel.
Dual-muffler exhaust system also increases low-rpm torque.
New piston shape with higher compression ratio increases mid- and high-rpm power
output.
New thinner piston ring for reduced engine friction.
Cylinder head features new exhaust port shape for improved power at high engine
speeds.
Intake valve seats incorporate a new material to improve valve durability.
New camshaft profile increases high-rpm power.
New 40mm Keihin FCR carburettor increases high-rpm power.
New ignition mapping works in conjunction with new cylinder head and camshaft
for improved power throughout the rev range.
New front wheel hub is lighter and stronger.
New shorter front fork outer tubes for lighter weight.
Radiators are mounted 5mm lower for lower centre of gravity and improved weight
feel.
New swingarm construction for lighter weight.
New front and rear suspension valving for improved bump absorption.
Engine/Drivetrain;
Powerful 249cm³ liquid-cooled 4-stroke 4-valve Unicam engine designed to produce
power across a wide rpm range for easy-to-control operation.
Lightweight and compact internal auto decompressor and handlebar-mounted hotstart
system provide superb operation, hot or cold.
Compact, lightweight engine assembly weighs only 23.9kg.
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 carburized camshaft directly actuating two
31mm titanium intake valves. The camshaft's centre exhaust lobe actuates two 26mm
steel exhaust valves via a low-friction forked roller rocker arm.
Lightweight titanium intake valves permit use of smaller valve springs, reducing
overall engine height.
High-strength, low-carbon steel crankshaft with carburised main journals for
maximum durability at sustained high-rpm operation.
Forged slipper piston and rings are lighter than conventional designs, revving quickly
while maintaining excellent cylinder sealing, high 12.9 : 1 compression ratio and highrpm
power.
Double-carburised connecting rod utilises a big-end needle bearing for maximum
high-rpm performance and durability.
Lightweight NiCaSil cylinder lining ensures cooler and quieter operation for
extended engine life.
Lightweight press-fitted aluminium spark plug pipe fits between forked exhaust
rocker arms, further contributing to compact cylinder head design.
40mm Keihin FCR carburettor features four rollers on the flat slide, resulting in very
light throttle effort, smooth operation, crisp throttle response and excellent rideability.
Carburettor features a Throttle Position Sensor (TPS) that helps maintain linear
throttle response throughout the rev range.
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 and the required oil pump size.
Vertically split crankcases feature a built-in oil pump, reducing weight 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.
Durable five-speed close-ratio transmission.
Magnesium ACG cover, clutch cover and cylinder head cover contribute to reduced
engine weight.
Lightweight stainless steel exhaust pipe and repackable aluminium silencers enhance
mass centralisation.
Dual radiators feature a refined core design for more effective heat dissipation
compared to conventional dual-radiator configurations.
Chassis/Suspension;
Fourth-generation twin-spar aluminium frame derived from Honda's CR series of
champions. Forged aluminium steering head and tapered downtube section are
designed to optimise frame rigidity, while tall swingarm pivot plates and thin frame
spars create a narrow overall frame cross-section for superb rider comfort and
manoeuvrability.
Frame design features a single, large-diameter tapered downtube. Two rugged boxsection
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.
Swingarm features dual-axis, double-taper design with a large cast aluminium crossmember.
Front and rear wheels feature lightweight HRC Works-type 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
to withstand torturous track conditions.
Lightweight, 47mm Showa inverted twin-chamber cartridge-type fork with
aluminium dampers. Fork offers 315mm of travel and 16-step rebound and
compression damping adjustability. Front fork outer-tubes receive same inner surface
honing treatment as Works bikes for low-friction operation.
Pro-Link single-shock rear suspension system features fully adjustable Showa rear
damper and 315mm 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 disc brakes.
Compact dual-piston front brake calliper, anodised aluminium brake pistons and
lightweight front brake rotor 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;
All plastic body components (radiator shroud, sidecovers, rear fender, seat base, fuel
tank, front fender and front number plate), offer a slim, aggressive style and light
weight.
Frame design allows airbox sidecovers to have larger intake ducts, contributing to
excellent airflow in the mid- and upper-rpm ranges.
Rider ergonomics optimised by adapting 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 foam construction follows the shape of the fuel tank, providing a
smooth transition to increase rider mobility and comfort.
'Non-slip' seat cover for enhanced rider control.
Cleated rear brake pedal and folding shift lever made of lightweight aluminium and
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.
Aluminium Renthal handlebar (971 bend) rubber-mounted to reduce rider fatigue
and improve comfort.
CR handlebar holders provide three different mounting positions: standard CRF250R
holder (CRF450/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.
Adjustable front brake lever.
Quick-adjust clutch perch for easy cable adjustment.
Clutch lever designed to improve feel and action.
Rugged chain guide material improves wear resistance that extends service life by
five times over conventional materials.
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.
Repackable silencer for maximum performance and minimal noise.
Comfortable, durable controls and high-quality fasteners.
Stainless steel clutch cable for long life.
Honda Racing-inspired colours and graphics.
Technical Specifications - CRF250R (ED-type);
Engine Type - Liquid-cooled 4-stroke 4-valve SOHC single
Displacement - 249.4cm3
Bore x Stroke - 78 x 52.2mm
Compression Ratio - 12.9 : 1
Max. Power Output - 31.5kW/11,000min-1 (95/1/EC)
Max. Torque - 29.2Nm/9,500min-1 (95/1/EC)
Fuel System;
Carburation - 40mm Keihin FCR flat slide carburettor with throttle
position sensor (TPS)
Fuel Tank Capacity - 7.3 litres
Electrical System;
Ignition System - Computer-controlled digital capacitor discharge with
electronic advance
Starter - Primary kick
Drivetrain;
Transmission - 5-speed
Primary Reduction - 3.116 (57/18)
Gear Ratios - 1; 2.142 (30/14), 2; 1.750 (28/16), 3; 1.450 (29/20), 4; 1.227 (27/22), 5; 1.041 (25/24)
Final Reduction - 3.923 (51/13)
Final Drive - #520 roller chain
Frame Type - Semi-double cradle; aluminium twin-spar
Chassis;
Dimensions - (LxWxH) 2,172 x ?827 x 1,277mm
Wheelbase - 1,479mm
Caster Angle - 27° 50'
Trail - 123mm
Seat Height- 965mm
Ground Clearance - 361mm
Dry Weight - 93.3kg
Kerb Weight - 101.1kg
Suspension;
Type - Front, 47mm inverted Showa leading-axle twin-chamber cartridge-type telescopic fork with 16-step adjustable compression and rebound damping; 315mm axle travel
Rear - Pro-Link with single Showa damper, adjustable lowspeed (13-step) & high-speed (3.5-turn) compression and 17-step rebound damping; 313mm axle travel
Wheels;
Type - Front, Aluminium rim/wire spoke
Rear - Aluminium rim/wire spoke
Rim Size - Front, 21 x 1.60
Rear 19 x 1.85
Tyre Size - Front, 80/100-21 51M
Rear - 100/90-19 57M
Brakes;
Type - Front, 240 x 3mm hydraulic disc with dual-piston calliper and
sintered metal pads
Rear - 240 x 4mm hydraulic disc with single-piston calliper and
sintered metal pads
All specifications are provisional and subject to change without notice.
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