Learning Center
Plans & pricing Sign in
Sign Out

honda CR125R 2005 Specifications


                   PRESS INFORMATION

      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.

   • Extreme Red (with White number plate and sidecovers)

                                                                     2005 CR125R - E1
Features and Benefits

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 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.


• New liquid-cooled two-stroke single-cylinder engine with 54 x 54.5mm bore and
stroke and 8.6 : 1 compression ratio.

                                                                    2005 CR125R - E2
• 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
• 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
• 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.

                                                                     2005 CR125R - E3

• 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 sub-
cylinder 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.

                                                                         2005 CR125R - E4
• Cleated rear brake pedal, shift lever and folding shift lever tip are made of lightweight
• Adjustable front brake lever for optimum control.
• Quick-adjust clutch perch.
• Aluminium Renthal handlebar is rubber-mounted to reduce rider fatigue and improve
• 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
• Repackable silencer for maximum performance and minimal noise.
• Stainless steel clutch cable for long life.

                                                                      2005 CR125R - E5
Specifications                CR125R (ED-type)

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

                                                                   2005 CR125R - E6
Type                        Front 46mm Kayaba inverted leading-axle twin-chamber cartridge-
                                   type 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

Type                        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

Type                        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
All specifications are provisional and subject to change without notice.

                                                                           2005 CR125R - E7

To top