An all-new 125cc engine makes the 2005 Honda CR125R the most potent two-stroke in its class.
Features & Benefits
New for 2005
- New crankcase intake tract and six-petal reed valve for more efficient air flow and improved drivability.
- New thicker reed plates for better off-idle response.
- Redesigned cylinder and cylinder head for improved power.
- New crankshaft design for improved performance.
- New piston features single keystone piston ring for improved sealing.
- Revised coolant flow for improved engine cooling and increased engine performance.
- Thicker radiator core (from 24mm to 28mm) improves cooling capacity to handle extra power.
- New RC valve changed from electrical to governor actuation for better sealing and improved power characteristics.
- New carb jetting specifications to match new engine characteristics.
- New shift fork shaft, shift forks and shift drum for improved shifting performance.
- ACG rotor weight increased to improve drivability.
- New swingarm features a dual-axis, double-taper design with a large cast aluminum cross member that is lighter weight and stronger.
- New rear hub is stronger and lighter.
- New Honda Racing-inspired graphics.
Engine/Drivetrain
- Liquid-cooled two-stroke single-cylinder engine with 54mm x 54.5mm bore and stroke and 8.6:1 compression ratio.
- Nikasil®-plated cylinder reduces friction and heat to improve overall performance.
- Piston ring groove is anodized for added durability.
- Air-intake boot is shaped for direct airflow and better low-speed engine performance.
- Foam gasket between airbox and air boot for better sealing and airflow management.
- 38mm Mikuni TMX carburetor with throttle position sensor (TPS).
- Carbon fiber six-petal reed valve with sub reeds is designed for better top-end and low-end power.
- Exhaust port is reshaped to improve top-end and over-rev power delivery.
- RC-style exhaust valve features an NSR road racing-inspired rotary flap design with governor control that provides a smooth power transition between low- and mid-range engine speeds. Redesigned exhaust valve flap features more overlap to minimize exhaust gas leakage between flap and cylinder.
- Exhaust header is designed to improve low-end and over-rev power delivery. The expansion chamber design enhances the engine's power output and delivery.
- A four-pole ACG design produces a high-voltage spark throughout the rpm range with low magnetic drag, thus permitting a freer-revving engine.
- A 16-bit processor in the ignition CPU produces immediate data calculation and extremely accurate ignition timing for the digital ignition.
- Eight clutch plates provide significant surface area to handle the engine's torque. Clutch springs provide a light feel at the lever.
- Dual radiators permit forward engine placement and provide significant cooling capacity.
- Steel water-pump gear and steel kickstarter-shaft collar enhance reliability.
- Primary kickstarting system allows starting in any gear.
Chassis/Suspension
- CR®125R's third-generation twin-spar aluminum frame features taller swingarm pivot plates and thinner frame spars to create a narrower overall frame cross-section, and is also lighter than the second-generation frame.
- 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 aluminum steering head provides a compact and extremely durable mount for the frame spars and engine downtube.
- Optional 20-inch front wheel improves cornering traction and rider comfort.
- Rear axle diameter of 25mm and large-diameter bearings provide significant rigidity to withstand torturous track conditions.
- Inverted Kayaba fork features a cartridge design that separates air and oil for reduced contamination and more consistent 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® single-shock rear suspension system features a fully adjustable Kayaba rear shock with 12.5 inches of travel, separate low-speed (18 positions) and high-speed (two turns) compression damping adjusters, and 30-position rebound damping. The adjusters are located together in a concentric fashion, with a screw inside a nut.
- Compact twin-piston front brake caliper, anodized aluminum brake pistons and lightweight front brake disc reduce unsprung weight for improved turning and handling.
- Large, 240mm front and rear brake rotors to provide optimum braking control.
Additional Features
- Seat 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 improved for self-cleaning, corrosion resistance, provide excellent grip and fold for extra ground clearance.
- Cleated rear brake pedal, shift lever and folding shift lever tip are made of lightweight aluminum.
- Adjustable front brake lever for optimum control.
- Quick-adjust clutch perch.
- Aluminum Renthal 971 bend 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 set 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 caliper from damage.
- Removable rear subframe allows easy maintenance.
- Dunlop D742 front and D756 rear tires for 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.
- Ownership includes one-year complimentary membership in the Honda Rider's Club of America™ (HRCA®). Benefits include: discounts, travel benefits, roadside assistance for off-road bike transport vehicle while motorcycle is being transported, one year complimentary subscription to Honda Red Rider™ magazine, access to HRCA Clubhouse Web site (www.hrca.honda.com), access online to Honda Common Service Manual. For HRCA details, call 1-800-847-HRCA. For dealers only, please call (310) 783-3958.