1995–2007 Honda CR80R / CR80RB Expert / CR85R / CR85RB Expert Service & Repair Manual

• 302-page Honda service manual covering the 1995 CR80R; 1996–2002 CR80R and CR80RB Expert; 2003–2004 CR85R and CR85RB Expert; and 2005–2007 CR85R/CR85RB Expert models—listed as “After ’04” in the manual—with separate data for the standard-wheel R and larger-wheel RB configurations.
• Engine and transmission repair: Covers engine removal and installation, cylinder-head and piston service, reed-valve inspection, clutch/kickstarter/gearshift repair, crankcase separation, crankshaft work, and six-speed transmission disassembly and reassembly.
• Fuel and ignition systems: Separates the PE68B, PE68D, PE68E, and PWK10A carburetors, with minor and major adjustment, disassembly, inspection, reassembly, float-level checks, reed-valve service, temperature/altitude tuning charts, and CDI/ICM diagnosis.
• Chassis, suspension, and brakes: Details frame and exhaust work, front fork and steering-stem repair, rear shock and Pro-Link overhaul, swingarm and wheel service, hydraulic brake bleeding, and master-cylinder/caliper rebuilds.
• Workshop reference: Includes competition maintenance schedules, torque tables, wear limits, lubrication and seal-point charts, Honda special-tool numbers, cable/harness routing views, system troubleshooting charts, and wiring diagrams for 1995–2002, 2003–2004, and after-2004 ignition systems.

Model and Revision Coverage

This manual follows the entire CR80/CR85 production span without treating all 13 years as one unchanged motorcycle. The specifications and procedures break out the 1995 CR80R, 1996–2002 CR80R/CR80RB, 2003–2004 CR85R/CR85RB, and after-2004 CR85R/CR85RB builds. Additional change points—after 1995, after 1997, and after 2002—appear where Honda revised the frame hardware, controls, suspension, brakes, exhaust, transmission, or ignition layout.

The engine tables document the change from the 82.9 cc CR80 to the 84.7 cc CR85, then separate the later revisions to port timing, transmission ratios, CDI/ICM configuration, exciter-coil testing, and exhaust sealing. The R and RB chassis are also distinguished: the R uses the smaller 17/14-inch wheel package, while the RB uses 19/16-inch wheels, with corresponding wheelbase, suspension, gearing, chain, sprocket, fork-spring, and shock-spring data.

Engine, Fuel, and Ignition Repair

Top-end repair can be carried out with the engine in the frame. Coverage includes cylinder-head removal, combustion-chamber decarbonizing, cylinder and piston inspection, piston-ring and pin checks, connecting-rod small-end inspection, and post-assembly checks for compression leaks, abnormal engine noise, secondary-air leaks, and coolant leaks. Bottom-end repair goes further into engine removal, clutch and primary-drive service, kickstarter and shift-linkage repair, crankcase separation, transmission inspection and assembly, crankshaft removal and installation, bearing replacement, and oil-seal installation.

Fuel-system coverage is model-specific rather than generic. The PE68-series and PWK10A chapters address the throttle valve, float, jets, starting-enrichment valve, air screw, fuel filter, air-cleaner housing, and reed valve. The tuning charts cross-reference air temperature and altitude with air-screw, slow-jet, needle, clip-position, and main-jet changes. Troubleshooting links rich or lean symptoms to intake leaks, crankshaft seals, blocked exhausts, fuel restrictions, and air-cleaner condition.

Ignition diagnosis includes spark testing, ignition-coil primary peak voltage, exciter-coil and pulse-generator peak voltage, coil resistance checks, ignition timing inspection, CDI/ICM service, and engine-stop-button continuity. The after-2004 system receives its own connectors, test points, component data, and wiring schematic.

Chassis, Suspension, Brakes, and Workshop Reference

Frame and body chapters cover the seat, side covers, rear fender, fuel tank, expansion chamber, silencer packing, and sub-frame removal and installation. Front-end repair includes handlebar and wheel service, separate 1995 and after-1995 fork overhaul procedures, seal and bushing replacement, fork oil filling and air bleeding, and steering-stem bearing work. Rear suspension coverage separates the 1995 shock from the after-1995 design and includes damper disassembly, valve-stack orientation, seal replacement, oil filling, bleeding, nitrogen charging, spring setup, Pro-Link bearing service, and swingarm repair.

The hydraulic disc-brake section covers fluid replacement and air bleeding, pad and disc inspection, front and rear master-cylinder repair, caliper disassembly and reassembly, hose and fitting checks, and pedal adjustment. General fault-isolation charts address hard starting, low power, poor low- or high-speed performance, and handling complaints.

Workshop visuals include frame/body/exhaust exploded assemblies, carburetor and reed-valve layouts, the cylinder/piston stack, crankcase and transmission assemblies, fork and shock-damper views, plus cable/harness routing and model-group ignition wiring diagrams. Tool listings identify the carburetor float-level gauge 07401-0010000, crankcase puller 07937-4300001, crank assembly tool 07965-1660102, peak-voltage adaptor 07HGJ-0020100, and model-specific fork and steering drivers, with U.S. alternatives noted where applicable.

The repair cautions are equally specific. The air-cleaner element must be installed with its UP mark correctly oriented; a poor seal allows dirt into the engine and accelerates piston-ring and cylinder wear. Rotating the cylinder during installation can catch the piston ring on a port and break it, while tightening the carburetor air screw against its seat can permanently damage the seat.

The scope fits professional technicians, independent repair shops, and experienced owners handling race maintenance, diagnosis, component repair, or full engine and chassis overhauls. Work with the engine and exhaust fully cooled, keep fuel service away from sparks or flame in a ventilated area, and treat the rear shock as a high-pressure nitrogen component.