2000–2003 Honda CR125R Service Manual (P/N 61GN200)

• Details the 2000–2003 Honda CR125R motocross lineup, documenting factory-recommended service procedures for the engine, cooling, frame, and electrical systems
• Official OEM first-edition publication Part # 61GN200 for the entire 2000–2003 production run
• Features 175 technical specification tables, 35 wiring and routing diagrams, and 12 exploded-view mechanical illustrations
• Provides comprehensive troubleshooting, a convenient PDF format, Mikuni TMX carburetor tuning, suspension overhauls, and complete engine removal procedures
• Covers the RC valve, crankcase separation, gearshift linkage, kickstarter assembly, clutch, and steering stem bearings

This 293-page reference is the primary factory source for the 2000–2003 CR125R, delivering the specific assembly, maintenance, and technical data needed for professional-level shop work. Having access to exact OEM clearances and torque specifications directly eliminates guesswork on the bench, ensuring reliable repair work and significantly reducing turnaround time for mechanics.

Inside the Manual

This workshop reference breaks down the entire motorcycle, starting with standard torque values, safety guidelines, and model identification. It moves into the removal and installation of major chassis components—including sub-frames, fuel tanks, and exhausts—before diving deep into the powertrain.

Instead of outsourcing expensive dealership jobs, technicians and DIYers can follow the step-by-step instructions for labor-intensive tasks like splitting the crankcase, rebuilding the telescopic front forks, overhauling the rear shock absorber, and performing a complete top-end rebuild. You get a detailed look at the CR125R's internal workings, covering the cylinder head, piston assembly, and transmission components.

When working on these specific 2-stroke models, mechanics frequently encounter top-end power loss caused by severe carbon buildup on the Radical Combustion (RC) flap valves and governor linkage. If not meticulously decarbonized at strict intervals, the mechanism will easily bind. Furthermore, the equipped Mikuni TMX carburetor is notoriously sensitive to temperature and altitude shifts, requiring exact adherence to the factory jetting guidelines to prevent lean-condition engine damage.

It also outlines the maintenance data for the liquid cooling system, hydraulic brakes, and the ignition system, complete with CDI unit and alternator exciter coil specs.

Technical Data & Specifications

The reference data includes critical clearances and tolerances, such as cylinder I.D. measurements and piston-to-cylinder clearance limits. It lists exact torque values for all primary fasteners, including the 128 N·m rear axle nut and the 27 N·m cylinder head nuts. You will also find factory fluid capacities—like the 0.57-liter transmission oil drain volume and 0.88-liter coolant capacity—plus jetting charts for tuning the fuel system across different altitudes and temperatures. To further support accurate servicing, the documentation features cable and harness routing diagrams, specific flow characteristics charts, tuning information charts, ignition peak voltage tables, and lubrication and seal points views.

Motorcycle maintenance involves inherent safety risks. This product description outlines the manual's contents and does not contain actual diagnostic or repair steps. Always rely on the complete factory data within the manual itself and follow standard shop safety practices when working on your machine.