Target Audience:
Enthusiasts, DIY mechanics, and professional technicians working on the 1983 Honda CR125R.
Manual Value Proposition:
Provides essential, detailed information for maintaining and repairing a vintage motocross bike, offering significant cost savings over professional service.
Content Highlights:
Comprehensive coverage of all major mechanical and electrical systems, extensive troubleshooting guides, and detailed specifications.
Added Value:
Free replacement offered for lost manuals, ensuring long-term accessibility.
Primary Coverage:
1983 Honda CR125R
Secondary Coverage:
General CR125 series maintenance and repair principles applicable to the era
Type:
Service Manual / Repair Manual
Format:
PDF (Digital Download)
Interactivity:
Clickable Chapters, Searchable Text
Restrictions:
No Printing Restrictions, No Saving Restrictions
Engine Systems:
Complete engine tear down and rebuild, carburetor, ignition system, cooling system, exhaust system, lubrication system, fuel delivery system.
Chassis Systems:
Front suspension (forks), rear suspension (swingarm, shock absorber, linkage), wheels, brakes (front and rear), steering, frame, bodywork (plastics, panels).
Electrical Systems:
Ignition coil, stator, magneto, lighting (if applicable), switches.
Maintenance:
Scheduled maintenance, routine checks, lubrication, filter replacement, cleaning.
Repair:
Complete engine rebuild, carburetor tuning, suspension overhaul, brake service, electrical component replacement, body panel repair.
Troubleshooting:
Diagnostic procedures for common issues, no spark diagnosis, starting problems, engine performance issues, suspension irregularities.
Installation:
Component installation guidance, e.g., exhaust, handlebars, fenders.
Depth:
Comprehensive: Covers complete tear down and rebuild, detailed diagnostics, and precise specifications.
Detail Level:
Includes detailed part diagrams, torque specifications, and step-by-step instructions.
Cooling System:
Liquid-cooled
Compression Ratio:
Approx. 8.9:1 (stock)
Horsepower:
Approx. 26-28 HP (estimated)
Torque:
Not explicitly stated in product info, but manual would contain specific figures.
Carburetor Model:
Keihin PWK (likely 28mm, specific model number in manual)
Fuel Type:
Unleaded gasoline mixed with two-stroke oil (specified ratio in manual).
Fuel Mixture Screw Adjustment:
Covered in manual.
Piston:
Single-ring, cast or forged (specifics in manual).
Crankshaft:
Press-fit, balanced (details in manual).
Connecting Rod:
Forged steel (specifics in manual).
Ignition System:
CDI (Capacitor Discharge Ignition) with magneto ignition coil and stator.
Spark Plug Type:
NGK (specific part number in manual, e.g., BR8ES).
Oil Type:
High-quality two-stroke motorcycle oil (viscosity and brand recommendations in manual).
Oil Mixture Ratio:
Specified in manual (commonly 20:1 or 32:1).
Length:
Refer to manual for precise dimensions.
Width:
Refer to manual for precise dimensions.
Height:
Refer to manual for precise dimensions.
Dry Weight:
Approx. 97 kg / 213 lbs (estimated).
Front Wheel Size:
21 inches
Rear Wheel Size:
18 inches
Front Tire Size:
80/100-21 (typical, specific recommendation in manual).
Rear Tire Size:
100/90-18 or 110/90-18 (typical, specific recommendation in manual).
Safety Standards:
N/A (Motocross bikes are not subject to standard road safety ratings).
Braking System:
Hydraulic disc brakes front and rear.
Brake Rotor Diameter:
Refer to manual for specific dimensions.
Frame Construction:
Steel semi-double cradle frame for rigidity and impact absorption.
Oil Change Interval:
Refer to manual for specific recommendations based on usage (e.g., after every race, every 10 hours).
Air Filter Cleaning:
Frequent cleaning recommended, especially in dusty conditions (detailed procedure in manual).
Spark Plug Maintenance:
Inspection and cleaning/replacement intervals specified in manual.
Engine Rebuild Interval:
Varies significantly based on usage and care; manual provides guidance on piston and ring wear limits.
Coolant Type:
Propylene glycol or ethylene glycol-based antifreeze mixed with distilled water (specific type and ratio in manual).
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid (specific type in manual).
Common Wear Items:
Piston and rings, clutch plates, wheel bearings, suspension seals and bushings, carburetor jets, exhaust packing.
Potential Problems:
Overheating due to radiator blockage or insufficient coolant, carburetor jetting issues impacting performance, worn suspension leading to poor handling, clutch slipping.
Engine Bolt Tightness:
Comprehensive torque specifications for all critical engine components are provided in the manual.
Chassis Bolt Tightness:
Comprehensive torque specifications for suspension, wheels, brakes, and other chassis components are provided in the manual.
Manufacturer:
Honda Motor Company, Ltd.
Motorsports Legacy:
Honda has a long and successful history in motorsports, including motocross, with the CR series being a dominant force.
Cr Series Context:
The CR125R was a cornerstone of Honda's motocross lineup, known for its performance, handling, and innovative technology for its era.
1983 Model Updates:
The 1983 model likely featured updates in suspension, engine tuning, and chassis design compared to previous years, reflecting Honda's continuous development.
Production Era:
The CR125R was produced from the late 1970s through the early 2000s.
