1998-1999 Honda CR125R Service Manual (P/N 61KN700)

• Official Honda publication (61KN700) detailing the 125cc liquid-cooled two-stroke competition platform.
• Documents essential factory specifications for the engine, chassis, and cooling systems.
• Features 94 technical diagrams, 48 torque-value tables, and detailed maintenance schedules tailored for race-cycle servicing.
• Highlights precise factory settings for the power-valve and transmission-gear ratios.

Technical Documentation and System Walkthrough

This factory-authorized reference outlines the complete disassembly, inspection, and assembly of the 124.82 cc power unit and twin-tube frame structure. Need to tear down the top end? The chapters cover everything from fuel system maintenance to the H.P.P. (Honda Power Port) valve and the constant-mesh 5-speed transmission. You will also find chassis-specific data for the Pro-Link rear suspension and hydraulic braking systems. Working on high-performance motocross bikes involves inherent mechanical hazards. Always review the designated safety protocols and utilize proper protective equipment before applying the tolerances documented inside.

Engine and Chassis Specification Preview

Accessing accurate technical data is critical for a reliable, track-ready rebuild. The documentation provides specific tightening values, fluid capacities, and wear limits to ensure precision maintenance. For instance, cylinder head bolt torque is set at 27 N·m. The main crankshaft bearing side clearance must measure between 0.4 and 0.8 mm. When dropping the fluids, transmission oil capacity is standardized at 0.57 liters, while the cooling system requires 0.90 liters for a complete change.

The guide also delivers comprehensive tuning tables for jetting adjustments based on altitude and temperature shifts. Ignition system charts specify a spark plug gap of 0.5 to 0.6 mm, alongside meticulous assembly data for the H.P.P. mechanism. Every critical metric for the 61KN700 model series is cataloged here for direct shop use.