1986-1991 Honda CR125R Motorcycle Service Manual

1986–1991 Honda CR125R Maintenance and Service Scope

• Covers 1986–1991 Honda CR125R motocross motorcycles, documenting engine, chassis, and electrical system specifications for the 125 cc 2-stroke engine
• Official manufacturer publication with original Honda engineering data, torque specifications, and system-level illustrations
• Contains 18 distinct service sections, including detailed exploded-view diagrams, transmission oil capacity charts, and ATAC/HPP exhaust valve system documentation
• Accessible from your device as soon as the order is placed
• Laid out for standard letter and A4 printing
• This 326-page reference is the primary documentation required for servicing the CR125R, documenting critical maintenance schedules across five years of development

Service Manual Chapter Walkthrough

This Honda CR125R service manual provides detailed technical information for the internal combustion engine and mechanical systems. The manual opens with essential identification and maintenance schedules, followed by extensive sections on the 2-stroke engine top end, including cylinder head, piston, and cylinder-porting specifications. Subsequent chapters detail the carburetor fuel system, including jet needle profiles and specific air-screw adjustments, alongside complete instructions for the transmission, clutch, and kickstarter mechanisms. The chassis documentation segment provides servicing details for the Pro-Link suspension, hydraulic brake system, and frame geometry, including fork air pressure and rear shock maintenance parameters.

Technical Data and Maintenance Specifications

Technical data includes comprehensive torque tables covering engine and chassis fasteners, from the cylinder head nut torque range of 24–29 Nm to fork pinch bolt values. Fluid capacities are explicitly listed, such as the 570 cc transmission oil requirement for post-1986 models and a 710 cc radiator coolant capacity. The document also includes specific sensor and ignition data, such as spark plug heat ranges and CDI unit requirements. Cooling system capacity for the Honda CR125R is documented at 710 cc for post-1987 models. Transmission oil level for 1986 models is specified at 700 cc in the lubrication section. Standard air pressure for the CR125R front fork is documented at 0 psi across the 1986–1990 production range. This 326-page OEM technical manual for the 1986–1991 Honda CR125R provides the exact specifications needed for engine, cooling, and chassis maintenance.

Document Reference: Honda Service Manual 86-91 CR125R, original OEM publication