1971 HONDA 100/125 CB100 Service Repair Manual

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Type: Motorcycle

Vendor:

Sku: 84810

Tags: 100 125 1971 CB Series CB100 Honda Motorcycle Motorcycles

Product variants

Description

This manual covers the CB100, CL100, SL100, CB125S, CD125S, and SL125 motorcycles produced in 1971. These models represent robust engineering and commitment to reliability, offering a range of versatile motorcycles that were popular for their performance and ease of use in the 1970s. The CB series provided standard, dependable transportation, while the CL and SL variants offered variations suited for different riding styles. These motorcycles are characterized by their efficient 4-stroke engines, with displacements of 99cc for the 100cc variants and 122cc for the 125cc variants, typically paired with 4- or 5-speed transmissions and chain drive. This comprehensive service and repair manual provides detailed information essential for maintaining and repairing these motorcycles. It covers a wide array of topics, including general information, periodic maintenance, tune-up procedures, engine, fuel and lubrication systems, electrical systems, chassis, and servicing information. The manual offers step-by-step instructions, troubleshooting guides, and technical specifications, making it an invaluable resource for owners and independent mechanics alike. Its detailed coverage aims to facilitate efficient diagnostics, repairs, and routine upkeep, ensuring the longevity and optimal performance of the vehicles.

🏷️ Basic Information

Identification

Make:

Honda

Model Lineup:

CB100, CL100, SL100, CB125S, CD125S, SL125

Model Year Covered:

Vehicle Type:

Motorcycle

Codes

Manual Product Code:

Not Specified

👋 Introduction

Market Position

Target Audience:

Honda motorcycle owners and independent mechanics seeking detailed service information.

Competitive Analysis

Value Proposition:

Provides professional-level repair and maintenance data, enabling cost savings through DIY repairs.

Key Features

Manual Type Distinction:

Authentic service manual utilized by factory-trained technicians.

Detail Level:

Step-by-step instructions and extensive repair information.

📋 Manual Details

Coverage Areas

Primary Coverage Areas:

General Information, Periodic Maintenance, Tune-up Procedures, Engine, Fuel and Lubrication System, Electrical System, Chassis, Servicing Information

Page Count

Page Count:

Manual Type

Manual Type:

Service and Repair Manual

Language

Language:

English

Format

File Format:

Downloadable:

Printable:

Compatibility:

Windows/Mac

Required Software:

Adobe PDF Reader

📖 Manual Coverage

Systems Covered

Engine:

Detailed coverage of engine disassembly, assembly, inspection, and repair.

Fuel System:

Carburetor tuning, cleaning, and repair; fuel tank and petcock servicing.

Lubrication System:

Oil pump operation, oil filter replacement, and lubrication points.

Electrical System:

Ignition system (spark plugs, coil, points, condenser), lighting, charging system (generator/alternator, rectifier/regulator), and wiring diagrams.

Chassis:

Frame inspection, suspension (front forks, rear shocks), steering, wheels, and brakes (drum brakes).

Procedures Included

Maintenance:

Periodic maintenance checks, oil changes, filter replacements, chain adjustment, and brake adjustments.

Tune Up:

Detailed procedures for carburetor synchronization, ignition timing, valve clearance adjustment, and general engine tuning.

Diagnostics:

Troubleshooting guides and fault diagnosis for common issues across all systems.

Repair:

Step-by-step repair instructions for major components and sub-assemblies.

Technical Depth

Depth:

Comprehensive, covering routine maintenance to major overhauls and diagnostics. Designed for professional technicians.

Parts Information

Parts Reference:

Implied to cover part identification for repair purposes, though specific part numbers are not listed in the product description.

Troubleshooting

Troubleshooting Approach:

Systematic diagnosis of common problems with logical solutions.

📊 Manual Specifications

File Format

PDF Searchability:

Likely text-searchable if scanned with OCR, but not guaranteed without explicit mention.

Print Quality

Print Quality Description:

Digital PDF download. Print quality depends on user's printer.

Binding Type

Binding Type:

Not Applicable (Digital Download)

Paper Type

Paper Type:

Not Applicable (Digital Download)

Content Quality

Instruction Style:

Clear, concise, step-by-step instructions with technical diagrams (implied by 'very detailed').

⚙️ Engine Specifications

Primary Engine

Engine Type:

4-stroke, OHC, Air-Cooled Twin-Cylinder (for CB100/CL100/SL100) and Single-Cylinder (for CB125S/CD125S/SL125)

Displacement 100Cc Variants:

99cc (CB100, CL100, SL100)

Displacement 125Cc Variants:

122cc (CB125S, CD125S, SL125)

Performance

Estimated Horsepower 100Cc:

Approximately 10-11 HP (specific figures vary by model and tuning)

Estimated Horsepower 125Cc:

Approximately 11-13 HP (specific figures vary by model and tuning)

Fuel System

Carburetor Type:

Typically single Keihin carburetor (specific model may vary)

Fuel Type:

Unleaded gasoline (Octane rating as per Honda recommendation, likely 87 or higher)

🔧 Transmission

Standard

Transmission Type:

4-speed or 5-speed constant mesh, foot-shifted

Optional

Transmission Variants:

Some models may have 4-speed, others 5-speed.

Features

Clutch Type:

Wet, multi-plate

Final Drive:

Chain drive

📐 Dimensions

Exterior

Overall Length:

Varies by model (e.g., CB100 ~72 inches)

Wheelbase:

Varies by model (e.g., CB100 ~49 inches)

Weights

Dry Weight:

Varies by model (e.g., CB100 ~240 lbs)

🛡️ Safety Features

Active Features

Braking System:

Front and rear drum brakes

Lighting:

Headlight, taillight, brake light, turn signals (depending on model variation)

Passive Features

Frame Construction:

Steel cradle frame

💡 Technology Features

Infotainment

Infotainment Systems:

None (basic analog gauges for speedometer, odometer, and neutral indicator).

Driver Assistance

Driver Assistance Features:

Connectivity

Connectivity Features:

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 1,000-2,000 miles or 6 months (refer to manual for exact specifications).

Tune Up Interval:

Recommended annually or every 3,000-5,000 miles, including spark plugs, points, and carburetor adjustments.

Valve Clearance Interval:

Typically every 2,000-4,000 miles.

Fluid Specifications

Engine Oil Type:

SAE 10W-30 API SE or SF (common for the era, consult manual for precise recommendation).

Engine Oil Capacity:

Approximately 1.0-1.5 quarts (refer to manual for exact capacity).

Brake Fluid Type:

Not applicable (drum brakes typically do not use hydraulic fluid).

Chain Lube Type:

Motorcycle chain lubricant.

Known Issues

Common Wear Items:

Spark plugs, ignition points, carburetor jets, chain and sprockets, brake shoes.

Electrical Aging:

Wiring harness degradation, aging voltage regulators, and headlight/taillight bulb failures can occur over time.

Carburetor Issues:

Clogged jets, worn floats, and incorrect adjustments can lead to poor running conditions.

Fuel System Aging:

Fuel petcock leaks and deteriorating fuel lines are common with age.

📚 Vehicle History

Brand Heritage

Honda Motorcycles 1970S:

Honda established a strong reputation for reliable and innovative motorcycles in the 1970s, particularly with its smaller displacement models.

Model Evolution

Cb Series Context:

The CB series represented Honda's popular line of standard motorcycles, known for their versatility and ease of use.

Cl Sl Variants:

CL and SL models often denoted 'Scrambler' or 'Trail' variants, featuring higher exhausts and more rugged styling.

Production

Production Era:

These models were part of Honda's successful small-displacement motorcycle offerings throughout the 1970s.

🏆 Awards & Recognition

Recognitions

Brand Reputation 1970S:

Honda was widely recognized for building reliable, high-quality motorcycles during this period.

Ratings

Consumer Perception:

Models like the CB series were popular among a wide range of riders for their dependability and performance for their class.