2005 Honda CR125R
Motivated by its all-new RC-valve-equipped 2-stroke engine for a stronger, more
widely useable power delivery, a slimmer, easier-manoeuvring chassis configuration and
progressive Works-class suspension systems, the new CR125R provides a winning
combination of blistering performance and crisp, confident handling to tear over the
rough spots and through the corners quicker than anything it its class.
Colours
Extreme Red (with White number plate and sidecovers)
New Features
New crankcase intake tract and six-petal reed valve for more efficient air flow and
improved driveability.
Redesigned cylinder and cylinder head for improved power.
New crankshaft design for improved performance.
New piston features single keystone piston ring for improved sealing.
New thicker reed plates for better off-idle response.
Revised coolant flow for improved engine cooling and increased engine performance.
New RC valve changed from electrical motor-drive to governor actuation for better
sealing and improved power characteristics.
New carburettor jetting specifications to match new engine characteristics.
New shift fork shaft, shift forks and shift drum for improved shifting performance and
enhanced durability.
Thicker radiator core (from 24mm to 28mm) improves cooling capacity to handle
extra power.
ACG rotor weight increased to improve driveability.
New Kayaba inverted fork features a new twin-chamber configuration with
compression sub-cylinder delivering more controlled suspension operation along with a
plusher ride.
New front axle placement for improved fork action and turning.
New swingarm features a dual-axis, double-taper design with a large cast aluminium
cross member that is lighter weight and stronger.
New rear hub is stronger and lighter.
New Honda Racing-inspired graphics.
Engine/Drivetrain
New liquid-cooled two-stroke single-cylinder engine with 54 x 54.5mm bore and
stroke and 8.6 : 1 compression ratio.
NiCaSil-plated cylinder reduces friction and heat to improve overall performance.
Piston ring groove is anodised for added durability.
Air intake boot reshaped for more direct airflow and better low-speed engine
performance.
Foam gasket between airbox and air boot for better sealing and airflow management.
38mm Mikuni TMX carburettor with throttle position sensor (TPS).
Carbon fibre six-petal reed valve with sub-reeds is designed for better top-end and
low-end power.
RC-style exhaust valve features a new rotary flap design with mechanical control that
provides a smooth power transition between low- and midrange engine speeds.
Redesigned exhaust valve flap features more overlap to minimise exhaust gas leakage
between flap and cylinder.
Exhaust header designed to improve low-end and over-rev power delivery. New
expansion chamber design enhances the engine's power output and delivery.
New four-pole ACG design produces a high-voltage spark throughout the rpm range
with low magnetic drag, thus permitting a freer-revving engine.
Digital ignition CPU features 16-bit processor for instantaneous data calculation and
extremely accurate ignition timing.
Eight-plate clutch provides significant surface area to handle the engine's torque.
Clutch springs provide a light feel at the lever.
Dual radiators permit forward engine placement while providing significant cooling
capacity.
Steel water-pump gear and steel kickstarter-shaft collar enhance reliability.
Final 13T/52T drive gearing complements the engine's power characteristics for
strong acceleration.
Durable 5-speed close-ratio transmission offers consistent performance in demanding
racetrack conditions.
Primary kickstarting system allows starting in any gear.
Chassis/Suspension
CR125R's 3rd-generation twin-spar aluminium frame features taller swingarm pivot
plates and thinner frame spars to create a narrower overall frame cross-section, and is
also lighter than its earlier configuration.
Semi-double-cradle 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.
Inverted Kayaba fork features a new twin-chamber design with compression subcylinder
for improved fork action. Inner surface of fork's outer tubes is honed to retain a
thin coating of lubricating oil to reduce friction with fork bushings.
Pro-Link rear suspension system features a single, fully adjustable Kayaba rear
damper with 320mm of wheel travel, separate low-speed (18-step) and high-speed (2
turns) compression damping adjusters, and 30-step adjustable rebound damping. The
adjusters are located together in a concentric design, with a screw inside a nut.
Front and rear wheels feature lightweight aluminium spoke nipples to help reduce
unsprung weight.
Optional 20" front wheel improves cornering traction and rider comfort.
Large, 240mm front and rear brake rotors stopped by a compact and highly responsive
dual-piston front brake calliper and lightweight single-piston rear calliper for optimum
braking control.
Lightweight 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
Seat follows the shape of the fuel tank, providing a smooth transition to increase rider mobility and comfort.
Non-slip seat cover enhances 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 optimum control.
Quick-adjust clutch perch.
Aluminium Renthal handlebar is rubber-mounted to reduce rider fatigue and improve
comfort.
CR handlebar holders provide three different mounting positions: standard CR125R
holder provides a 3mm rearward offset and can be rotated 180 degrees to position
handlebar 6mm forward. Optional holders (CR250R-type) provide neutral position to
match rider preference.
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.
Dunlop D742 front and D756 rear tyres provide optimum traction and cornering.
Washable, two-stage foam air filter for optimal engine protection and easy
maintenance.
Repackable silencer for maximum performance and minimal noise.
Stainless steel clutch cable for long life.
Specifications
Engine Type - Liquid-cooled 2-stroke single with RC exhaust valve
Displacement - 124.8cm3
Bore x Stroke - 54 x 54.5mm
Compression Ratio - 8.6 : 1
Max. Power Output - 31.3kW/11,500min-1 (95/1/EC)
Max. Torque - 21.2Nm/10,000min-1 (95/1/EC)
Carburation - 38mm Mikuni TMXX flat slide carburettor with Throttle Position Sensor (TPS)
Ignition System - Digital electronic with 3-D mapping and electronic advance
Starter Primary - kick
Transmission - 5-speed
Primary Reduction - 3.150 (63/20)
Gear Ratios - 1 2.308 (30/13), 2 1.867 (28/15), 3 1.529 (26/17), 4 1.294 (22/17), 5 1.130 (26/23)
Final Reduction - 4.000 (52/13)
Final Drive - #520 roller chain
Frame - Semi-double cradle; aluminium twin-spar
Dimensions - (LxWxH) 2,160 x 821 x 1,282mm
Wheelbase - 1,468mm
Caster Angle - 25° 46'
Trail - 102mm
Seat Height - 954mm
Ground Clearance - 352mm
Fuel Tank Capacity - 7.7 litres
Dry Weight - 88.7kg
Kerb Weight - 97.6kg
Suspension Type - Front, 46mm Kayaba inverted leading-axle twin-chamber cartridgetype
telescopic fork with 20-step adjustable compression and 18-step rebound damping; 305mm axle travel, Rear - Pro-Link with Kayaba single damper, adjustable low-speed (18-step) & high-speed (2-turn) compression and 30-step rebound damping; 320mm axle travel
Wheels - Front, 21 x 1.60 aluminium rim/wire spoke, Rear - 19 x 1.85 aluminium rim/wire spoke
Tyres - Front, 80/100-21 51M, Rear - 100/90-19 57M
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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