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2005 Honda CR125R

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