2005 Honda CRF250X
A compact and exciting dirt bike with a Works racer's pedigree, the blazing
CRF250X gives you the same blast of performance, high-revving 4-stroke engine and
lightweight aluminium frame as the dynamic CRF250R motocrosser. On top of that, it
gives you the extra-added convenience of easy and reliable push-button electric starting,
a smooth-shifting wide-ratio transmission, enduro-style lights for when your fun keeps
going after the sun goes down, and versatile performance that's been specially tuned for
more high-flying, roost-throwing, dirt riding fun than you've ever had in a single dirtriding machine.
Colours
Extreme Red (with White number plate and sidecovers)
New Features
New rear wheel hub is lighter and stronger.
Honda Racing-inspired colours and graphics.
Unique Features
Push-button electric start system for easy start-ups in all conditions.
Exhaust emissions comply with all local regulations for off-road motorcycles.
Large 8.3-litre fuel tank capacity.
Resettable, easy-to-read three-digit competition odometer.
Spark arrester-equipped silencer complies with all local fire and noise regulations.
Powerful 35-watt halogen headlight features new lens type for wide range of
illumination.
Eye-catching LED taillight integrated into rear fender.
Convenient sidestand.
Easy-access urethane foam air filter.
Smooth-shifting wide-ratio 5-speed transmission.
Suspension tuned for enduro riding needs.
18" rear wheel provides enhanced protection against flat tyres.
New T-ring sealed chain is narrower, stronger and lighter compared to conventional
chains.
Engine/Drivetrain
Powerful liquid-cooled 249cm3 4-stroke 4-valve Unicam engine is designed to
produce power across a wide rpm band for easy-to-control operation.
Electric starter drives the clutch side of the crankshaft to provide superior lubrication
of starter gears, and produce a narrow engine with a short, strong crankshaft.
Lightweight, compact, internal auto decompressor system provides superb coldstarting
and hot-starting operation.
Compact, lightweight engine assembly weighs only 26.4kg.
Unique Honda Unicam valve train provides both the light weight of a compact singlecam
design and an optimum combustion chamber shape for maximum power at all
engine rpm.
Unicam valve train features a single carburised camshaft directly actuating two 31mm
titanium intake valves from above. The camshaft's centre exhaust lobe actuates two
26mm steel exhaust valves via a forked, low-friction, 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.
ACG cover, clutch cover and cylinder head cover are made of magnesium to reduce
engine weight.
Forged 12.5:1 compression slipper piston is lighter than conventional designs, for
quick-revving response while maintaining excellent cylinder sealing and high-rpm
power.
Double-carburised connecting rod utilises an updated big-end needle bearing and
thrust washers 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.
37mm Keihin FCR-type 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 rpm 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,
reduces the amount of circulating oil and permits the use of a smaller oil pump.
Vertically split crankcases feature a built-in oil pump, reducing weight compared to
conventional designs.
Exhaust system uses a lightweight stainless steel exhaust header and muffler equipped
with spark arrester.
Dual radiators feature a refined core area for improved heat dissipation compared to
conventional dual-radiator designs, and a compact coolant recovery tank.
Gear-driven balancer reduces vibration and drives the water pump.
Eight clutch plates provide the surface area necessary to handle the engine's massive
torque, while carefully matched clutch springs provide a light feel at the lever.
New T-ring-sealed chain is approximately 1.6mm narrower, and stronger compared to
conventional chains.
Durable 5-speed wide-ratio transmission.
Chassis/Suspension
All-new 4th-generation twin-spar aluminium frame is derived from Honda's CR series
of championship motocrossers.
Forged aluminium steering head and tapered downtube section designed for optimised
frame rigidity. In addition, tall swingarm pivot plates and narrow 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.
The aluminium frame design is matched to rider ergonomics to maximise handling and
control operation.
Lightweight, 47mm Showa inverted twin-chamber cartridge-type fork with aluminium
dampers is derived from the CRF250R and features settings unique to the CRF250X.
The fork offers 315mm of travel, 16-step rebound and 16-step compression damping
adjustability. The inner surfaces of the front fork outer tubes receive the same honing
treatment as Works bikes for low-friction operation.
Pro-Link rear suspension system features a single, 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 adjustable rebound damping.
Large 50mm rear damper piston diameter provides consistent performance under
demanding riding conditions.
Swingarm features a dual-axis, double-taper design with a large cast aluminium crossmember
offering high strength and light weight.
Front wheel features large-diameter front axle and wide wheel-bearing span for
excellent rigidity.
18" rear wheel features same lightweight rear hub and HRC Works-type lightweight
aluminium spoke nipples as used on CRF250R for reduced unsprung weight.
Rear axle diameter of 25mm and large-diameter bearings provide optimum rigidity
and strength to withstand torturous track conditions.
Large, 240mm front and rear brake rotors.
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 the need for a remote master cylinder reservoir and hose
assembly.
Additional Features
All plastic body components (radiator shroud, side covers, rear fender, seat base, fuel
tank, front fender, and front headlight) are designed for slimmer, more aggressive
styling and light weight.
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 uses foam construction that follows the shape of the fuel tank, providing
a smooth transition to increase rider mobility and comfort.
Non-slip seat cover enhances rider control.
Rear brake pedal and 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, resist corrosion, provide
excellent grip and fold for extra ground clearance.
Aluminium Renthal handlebar (971 bend) is rubber-mounted to reduce rider fatigue
and improve comfort.
CR handlebar holders provide three different mounting positions: standard CRF250X
holder (CRF450R/CR125R/CRF250R-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.
Chain guide material offers improved wear resistance, with service life five times
greater than 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.
Comfortable, durable controls and high-quality fasteners.
Stainless steel clutch cable for long life.
Honda Racing-inspired colours and graphics.
Specifications
Engine - Liquid-cooled 4-stroke 4-valve SOHC single
Displacement - 249.4cm3
Bore x Stroke - 78 x 52.2mm
Compression Ratio - 12.5 : 1
Max. Power Output - 20.5kW/9,000min-1 (95/1/EC)
Max. Torque - 22.5Nm/8,000min-1 (95/1/EC)
Carburation - 37mm Keihin FCR flat slide carburettor with throttle
position sensor (TPS)
Ignition System - Computer-controlled digital capacitor discharge with
electronic advance
Starter - Primary kick
Transmission - 5-speed
Primary Reduction - 3.611 (65/18)
Gear Ratios - 1 2.385 (31/13), 2 1.750 (28/16), 3 1.333 (28/21), 4 1.042 (25/24), 5 0.815 (22/27)
Final Reduction - 3.769 (49/13)
Final Drive - #520 T-ring roller chain
Frame - Semi-double cradle; aluminium twin-spar
Dimensions - (LxWxH) 2,172 x? 827 x ?1,263mm
Wheelbase - 1,488mm
Caster Angle - 27° 29'
Trail - 120.3mm
Seat Height - 963mm
Ground Clearance - 361mm
Fuel Tank Capacity - 8.3 litres
Dry Weight - 113.4kg
Kerb Weight - 124.5kg
Suspension - Front, 47mm inverted Showa leading-axle twin-chamber cartridgetype
telescopic fork with 16-step adjustable compression and rebound damping; 315mm axle travel,
Rear - Pro-Link with single Showa damper, adjustable low-speed (13-step) & high-speed (3.5-turn) compression and 17-step rebound damping; 315mm axle travel
Wheels - Front, 21 x 1.60 aluminium rim/wire spoke, Rear - 18 x 2.15 aluminium rim/wire spoke
Tyres - Front, 80/100-21 51M, Rear - 100/100-18 62M
Brakes - Front, 240 x 4.5mm hydraulic disc with dual-piston calliper and
sintered metal pads, Rear - 240 x 4.5mm hydraulic disc with single-piston calliper and
sintered metal pads
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