Yamaha R5C 1972 1973 Workshop Repair Service Manual

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Tipo: Motorcycle

Proveedor:

SKU: 66338

Etiquetas: 1972 1973 Misc Motorcycle Motorcycles R5C Yamaha

Variantes de producto

Descripción

The Yamaha R5C, produced in 1972 and 1973, represents a performance-oriented, air-cooled, two-stroke parallel-twin motorcycle that emphasized lightweight design and spirited acceleration. This model reflects the engineering and styling prevalent in Japanese motorcycles of the early 1970s, competing with similar displacement offerings from other major manufacturers. Its design focused on delivering a dynamic riding experience, characteristic of Yamaha's early reputation for high-performance two-stroke engines. This comprehensive workshop service manual provides detailed guidance for the maintenance and repair of the Yamaha R5C. It covers essential systems including the engine, transmission, chassis, electrical components, and bodywork. The manual includes step-by-step repair instructions, routine maintenance procedures, troubleshooting guidance for common issues, and critical technical specifications such as torque settings and fluid capacities. This resource is designed to assist owners and technicians in keeping the R5C in optimal working condition.

🏷️ Basic Information

Identification

Make:

Yamaha

Model:

Year:

1972, 1973

Codes

Model Code:

👋 Introduction

Market Position

Positioning:

Performance-oriented twin-cylinder motorcycle of its era, targeted at enthusiasts and riders seeking spirited performance.

Competitive Analysis

Competitors:

Competed with other 350cc to 400cc two-stroke motorcycles from manufacturers like Kawasaki, Suzuki, and Honda.

Key Features

Engine Type:

Air-cooled, two-stroke, parallel-twin

Performance Focus:

Emphasis on lightweight design and strong acceleration characteristic of two-stroke engines.

Design Era:

Reflects the styling and engineering prevalent in Japanese motorcycles of the early 1970s.

📋 Manual Details

Coverage Areas

Coverage Type:

Comprehensive Workshop Repair & Service

Page Count

Pages:

Manual Type

Type:

Workshop Service Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Engine:

Engine assembly, disassembly, tuning, lubrication, cooling, fuel, ignition, exhaust

Transmission:

Clutch, gearbox operation, maintenance, troubleshooting

Chassis:

Frame, suspension (front and rear), steering, wheels, tires, brakes (front and rear drum)

Electrical:

Lighting system, ignition system, charging system, wiring diagrams, battery, instrumentation

Bodywork:

Body panels, fuel tank, seat, handlebars, fenders

Procedures Included

Maintenance:

Routine maintenance, oil changes, filter replacements, chain adjustment, spark plug service

Troubleshooting:

Diagnostic procedures for common mechanical and electrical issues

Repair:

Detailed step-by-step instructions for component disassembly, repair, and reassembly

Specifications:

Torque specifications, clearances, fluid capacities, electrical resistance values

Technical Depth

Depth:

Designed for mechanical technicians, covering in-depth repairs and diagnostics

📊 Manual Specifications

File Format

Format:

Digital (PDF)

Print Quality

Quality:

High-resolution scans suitable for printing

Binding Type

Binding:

N/A (Digital Download)

Paper Type

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Two-stroke, air-cooled, parallel-twin

Displacement:

347 cc (21.18 cubic inches)

Bore X Stroke:

54.0 mm x 74.0 mm (2.13 in x 2.91 in)

Compression Ratio:

6.8:1

Carburetion:

Two (2) Mikuni VM30SC carburetors

Ignition:

CDI (Capacitor Discharge Ignition)

Performance

Horsepower:

Approximately 33 HP @ 7,500 RPM (Manufacturer claimed)

Torque:

Not explicitly stated, but characteristic of its class for the era.

Fuel System

Fuel Type:

Unleaded gasoline with 2-stroke oil mixture (e.g., 50:1 or 32:1 depending on oil quality and manufacturer recommendation).

Fuel Tank Capacity:

Approx. 2.6 US gallons (9.8 Liters)

🔧 Transmission

Standard

Type:

Constant mesh, 5-speed

Clutch:

Wet, multiple disc

Features

Drive Type:

Chain drive

📐 Dimensions

Exterior

Overall Length:

Approx. 82.3 inches (2090 mm)

Overall Width:

Approx. 31.7 inches (805 mm)

Overall Height:

Approx. 46.3 inches (1175 mm)

Weights

Dry Weight:

Approx. 348 lbs (158 kg)

Wet Weight:

Not explicitly specified, but would include oil, fuel, and battery weight.

🛡️ Safety Features

Ratings

Safety Standards:

No formal crash ratings or safety certifications like modern vehicles; safety relied on rider skill and mechanical integrity.

Active Features

Brakes:

Front and Rear Drum Brakes. Mechanical actuation via cables.

Passive Features

Lighting:

Headlight, taillight, brake light, turn signals (depending on market specification).

Frame Construction:

Steel cradle frame designed for rigidity and handling.

💡 Technology Features

Infotainment

Features:

N/A. This is a vintage motorcycle; technology features are limited to essential functions.

Driver Assistance

Features:

N/A. No driver assistance systems.

Connectivity

Features:

N/A. No electronic connectivity features.

🔧 Maintenance

Service Intervals

Oil Change:

Refer to manual for specific engine oil change intervals based on mileage or operating hours. Typically every 2,000-3,000 miles or annually.

Spark Plug:

Regular inspection and cleaning/replacement recommended based on mileage (e.g., every 1,000-2,000 miles).

Chain Maintenance:

Frequent lubrication and tension adjustment is critical for longevity and performance.

Fluid Specifications

Engine Oil Type:

Specific 2-stroke pre-mix oil suitable for air-cooled engines. Manual will specify viscosity and API classification, if applicable.

Gearbox Oil:

Yamaha Gear Oil 10W-30 or equivalent is commonly recommended for the transmission. Capacity: ~1.2 Liters.

Brake Fluid:

Not applicable, as drum brakes are mechanically actuated. Cable lubrication is required.

Known Issues

Two Stroke Wear:

Typical for vintage two-strokes: piston ring wear, cylinder scoring, carbon buildup in ports and exhaust, reed valve wear.

Carburetor:

Carburetors (Mikuni VM30SC) can be prone to clogging, worn jets, and float issues if not maintained.

Electrical System:

Aging wiring harnesses, corroded connectors, and failing stator or rectifier can cause electrical gremlins.

Clutch Slippage:

Clutch plates can wear out, leading to slippage, especially with aggressive riding.

📚 Vehicle History

Brand Heritage

Heritage:

Yamaha Motor Company, founded in 1955, rapidly established a reputation for high-performance motorcycles, particularly in the two-stroke segment.

Model Evolution

Predecessor:

The R5C is an evolution of Yamaha's R5 series, building upon the R5 (1970-1972) which itself was an evolution of earlier models like the DS6.

Distinguishing Features:

The 'C' designation often signifies updates or minor revisions over previous iterations, potentially including styling or minor mechanical tweaks.

Production

Production Period:

1972-1973

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Type:

Not applicable in the modern sense. The R5C was well-regarded in its class for performance and handling, contributing to Yamaha's growing reputation.