2007 CR250R PRESS INFORMATION

2007 CR250R PRESS INFORMATION
2007
CR250R
PRESS INFORMATION
With its legendary balance of power and handling, the CR250R keeps running at
the head of the pack and flying with the champions of the motocross world for yet
another hard-charging season.
Colours
z Extreme Red (with White number plate and sidecovers)
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Features and Benefits
Engine/Drivetrain
„ Liquid-cooled two-stroke 249cm3 single-cylinder engine with 66.4 × 72mm bore
and stroke and 9 : 1 compression ratio.
„ Precision-cut stainless steel cylinder base gasket and optimised port timing for
awesome bottom-end and midrange power.
„ Cylinder head combustion chamber shape ensures excellent bottom-end and
midrange power.
„ Piston dome shaped for improved intake charge flow.
„ Piston features single keystone piston ring for low friction and best sealing.
„ Crankshaft design enhances driveability.
„ Crankcase intake and scavenging ports designed for smoother air flow, while crank
journal thickness ensures reduced crank deflection.
„ Crankcase reed induction with six-petal carbon fibre reed valve contributes to
excellent off-idle throttle response, and top-end and over-rev power delivery.
„ Reed valve mounting angle maximises charge flow and top-end power.
„ Air intake boot shaped for more direct airflow, contributing to stronger low-speed
engine performance.
„ Foam gasket between airbox and air boot ensures better sealing and airflow
management.
„ Lightweight 38mm flat-slide Mikuni TMX carburettor provides both initial throttle
crispness and instant throttle response to complement the engine’s power
characteristics. Carburettor has throttle position sensor (TPS) to calibrate timing
with exhaust valve for improved power delivery.
„ Cylinder design features RC exhaust valve housed in removable case for sure
sealing and top performance.
„ One-piece exhaust valve provides improved sealing.
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„ A 16-bit CPU incorporates both the DC Capacitor Discharge ignition and exhaust
valve servo control, producing instantaneous data calculation and extremely
accurate ignition and exhaust valve timing for maximum performance.
„ ECU mapping and RC valve control settings optimally matched to engine power
characteristics.
„ RC-style exhaust valve features NSR road racing-inspired rotary flap design with
electronic control. The electronic control module uses engine rpm and throttle
(TPS) opening to calculate exhaust valve position and signal a DC servo motor to
adjust the RC valve, providing both a smooth transition from low- to midrange rpm
and a broader torque curve.
„ Eight-plate clutch provides significant surface area to handle the engine’s torque while
carefully matched clutch springs provide a light feel at the lever.
„ Clutch damper design improves rear suspension feel and action while accelerating
over bumps.
„ Lightweight magnesium clutch cover.
„ Durable 5-speed close-ratio transmission offers consistent performance in
demanding racetrack conditions.
„ Shift fork shaft, shift forks and shift drum ensure smooth shifting performance.
„ Primary kickstarting system allows starting in any gear.
„ Exhaust header and expansion chamber designed to maximise top-end power
delivery.
„ Exhaust pipe shape maximises volume for optimised low- to midrange power.
„ Dual radiators permit forward engine placement while providing significant cooling
capacity.
„ 28mm radiator core ensures optimum cooling capacity for engine’s power.
„ Steel water-pump gear for excellent reliability.
Chassis/Suspension
„ Third-generation aluminium twin-spar frame delivers superior rider comfort and
manoeuvrability.
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„ Semi-double-cradle design features a single large-diameter, tapered down-tube.
Two rugged box-section rails attach to the base of the down-tube and support the
engine. A forged aluminium steering head provides a compact and extremely
durable mount for the frame spars and engine down-tube.
„ Fine-tuned suspension settings deliver more controlled suspension action along
with a plusher ride.
„ Lightweight, 47mm inverted Showa twin-chamber cartridge-type fork with
aluminium damper rods features 280mm of travel, 16-step rebound damping
adjustability and 16-step compression damping adjustability. The inner surface of
the front fork outer tubes receives the same honing treatment as Honda’s Works
bikes for low-friction operation.
„ Swingarm features a dual-axis, double-taper design with a large cast aluminium
cross member that is lighter weight and stronger.
„ Pro-Link rear suspension system features a single, fully adjustable Showa rear
damper and 316mm of wheel travel, separate low-speed (13-step) and high-speed
(3.5 turns) compression damping adjusters, and 17-step adjustable rebound
damping.
„ Large 50mm-diameter rear damper piston provides consistent performance under
demanding riding conditions.
„ Front and rear wheels feature lightweight HRC Works-type aluminium spoke
nipples to help reduce unsprung weight.
„ Front wheel features large-diameter front axle and wide wheel bearing span for
additional rigidity.
„ Optional 20" front wheel improves cornering traction and rider comfort.
„ Rear axle diameter of 25mm and large-diameter bearings provide optimum rigidity
and strength to withstand torturous track conditions.
„ Compact dual-piston front brake calliper with anodised aluminium pistons and
lightweight rotor reduce unsprung weight for improved turning and handling.
„ HRC Works-type rear brake system integrates the rear master cylinder and fluid
reservoir, eliminating the rear master cylinder reservoir and hose.
„ Large 240mm front and rear brake rotors provide optimum braking control.
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Additional Features
„ Carefully developed ergonomics position the rider’s legs at the narrowest crosssection of the frame for improved comfort while maintaining excellent handling
feel.
„ Brake pedal and shift lever designed to complement the riding position.
„ Brake pedal features optimised ratio to match integrated rear brake master cylinder
design.
„ Seat cushion follows the shape of the fuel tank, providing a smooth transition to
increase rider mobility and comfort.
„ Non-slip seat cover for increased rider control.
„ Wide, cleated stainless steel footpegs are self-cleaning, resist corrosion, provide
excellent grip and fold for extra ground clearance.
„ Cleated rear brake pedal, shift lever and folding shift lever tip are made of
lightweight aluminium.
„ Adjustable front brake lever for maximum control.
„ Quick-adjust clutch perch.
„ Dunlop D742 front and D756 rear tyres for optimum traction and cornering.
„ CR handlebar holders provide three different mounting positions: standard CR250R
holder provides neutral position and optional holder
(CRF450R/CR125R/CRF250R-type) provides +/-3mm fore or aft offset position to
match rider preference.
„ Aluminium Renthal 971 bend handlebar.
„ 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.
„ Repackable silencer for maximum performance and minimal noise.
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„ Comfortable, durable controls and high-quality fasteners.
„ Stainless steel clutch cable for long life.
„ Aggressive Honda Racing-inspired graphics.
6/8
Specifications CR250R ED-type
Engine
Type
Displacement
Bore x Stroke
Compression Ratio
Max. Power Output
Max. Torque
Liquid-cooled 2-stroke single
249.3cm³
66.4 x 72mm
8.5 : 1
35.6kW / 8,000min-1 (95/1/EC)
42.5Nm / 8,000min-1 (95/1/EC)
Fuel System
Carburation
38mm Mikuni TMX flat-slide carburettor with Throttle
Position Sensor (TPS)
7.7 litres
Fuel Tank Capacity
Electrical System
Ignition System
Starter
Digital electronic with 3-D mapping and electronic advance
Primary kick
Drivetrain
Transmission
Primary Reduction
Gear Ratio
1
2
3
4
5
Final Reduction
Final Drive
5-speed
3.000 (63/21)
1.800 (27/15)
1.470 (25/17)
1.210 (23/19)
1.000 (21/21)
0.869 (20/23)
3.692 (48/13)
#520 roller chain
Frame
Type
Semi-double cradle; aluminium twin-spar
Chassis
Dimensions
Wheelbase
Caster Angle
Trail
Seat Height
Ground Clearance
Dry Weight
Kerb Weight
(LxWxH)
2,185 x 821 x 1,275mm
1,487mm
27° 8'
111.7mm
950mm
347mm
96.7kg
104.8kg
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Suspension
Type
Front
Rear
47mm Showa inverted leading-axle twin-chamber
cartridge-type telescopic fork with 16-step adjustable
compression and rebound damping; 315mm axle travel
Pro-Link with Showa single damper, adjustable low-speed
(13-step) & high-speed (3.5-turn) compression and 17-step
rebound damping; 316mm axle travel
Wheels
Type
Rim Size
Tyre Size
Front
Rear
Front
Rear
Front
Rear
Aluminium rim/wire spoke
Aluminium rim/wire spoke
21 x 1.6
19 x 2.15
80/100 21 (51M)
110/90 19 (62M)
Front
240 x 3mm hydraulic disc with dual-piston calliper and
sintered metal pads
240 x 4mm hydraulic disc with single-piston calliper and
sintered metal pads
Brakes
Type
Rear
All specifications are provisional and subject to change without notice.
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