🏷️ Basic Information

Make:

Yamaha

Model:

RX125

Model Variant:

RX 125

Production Years Covered:

1978, 1979, 1980, 1981

Chassis Codes:

Likely 125-xxx or similar Yamaha chassis designation (specific codes not provided in product info but expected in manual)

Engine Codes:

Likely a 125cc 2-stroke engine designation (specific codes not provided in product info but expected in manual)

👋 Introduction

Target User:

Yamaha RX125 owners, independent motorcycle mechanics, restoration enthusiasts, and DIY motorcycle repair individuals.

Value Proposition:

Provides dealership-level repair and maintenance information at a significantly lower cost than official manuals or professional services. Instant download eliminates wait times and shipping costs.

Instant Access:

Immediate availability via digital download, allowing users to start working on their motorcycle without delay.

Multilingual Support:

Availability in English, German, and French caters to a broader international user base.

Practicality:

Printable sections allow for a clean, disposable reference during messy tasks, preserving the digital copy.

📋 Manual Details

General Topics:

Engine, General Information, Transmission, Chassis, Lightning (Electrical System), Steering, Seats System, Clutch, Suspension, Locks, Brakes, Lubrication, Electrical, Frame, Fuel System, Battery

Estimated Pages:

Variable, typical for this era and scope would be 200-500 pages (specific count not provided in product info)

Type:

Service Repair Workshop Manual

Languages Available:

English, German, French

Delivery Method:

Digital Download

File Format:

Adobe Acrobat PDF

📖 Manual Coverage

Engine Internals:

Cylinder, piston, crankshaft, connecting rod, lubrication, timing, cooling (if applicable), internal component specifications, disassembly and reassembly procedures.

Fuel System:

Carburetor(s) (identification, adjustment, cleaning, overhaul), fuel lines, fuel pump (if applicable), fuel tank inspection and maintenance.

Transmission Clutch:

Clutch operation, adjustment, replacement, transmission gear inspection, lubrication, troubleshooting, disassembly and reassembly of gearbox components.

Electrical System:

Ignition system (coil, points, condenser, timing), lighting (headlight, taillight, turn signals), charging system (stator, rectifier/regulator), wiring diagrams, component testing, battery maintenance.

Chassis Suspension:

Front fork (oil change, seal replacement, disassembly), rear shock absorber inspection and replacement, swingarm lubrication and bearing checks.

Brakes:

Drum brake (front and rear) adjustment, shoe replacement, linkage lubrication. Disc brake systems (if equipped) pad replacement, caliper service, fluid flush and bleed procedures.

Steering Locks:

Handlebar and steering head bearing inspection, lubrication, adjustment, lock mechanism service.

Maintenance Tasks:

Scheduled maintenance checks, lubrication points and schedules, filter replacement, spark plug replacement, chain adjustment and lubrication, tire pressure checks.

Troubleshooting Guides:

Diagnostic charts for common problems, symptom-based troubleshooting for engine performance, electrical faults, and mechanical issues.

Disassembly Reassembly:

Step-by-step instructions for removing, overhauling, and reinstalling major components and systems.

Technical Specifications:

Torque values for critical fasteners, engine timings, electrical resistance values, fluid capacities, dimensions.

Diagnostic Capabilities:

Covers basic to advanced diagnostics for mechanical and electrical systems, including how to interpret symptoms and perform specific tests.

Rebuild Scope:

Detailed instructions for complete engine rebuilds, transmission overhauls, and chassis component refurbishment.

📊 Manual Specifications

PDF Quality:

High-quality scans/digital reproductions suitable for printing and digital viewing. Likely includes searchable text for ease of navigation.

Printability:

Designed to be printable, allowing users to print specific sections or the entire manual for workshop use.

Digital Binding:

N/A (Digital PDF, user can bind digitally or print and bind)

Print Recommendation:

Recommended for printing on standard printer paper, ideal for placement in 3-ring binders for durability and organization.

⚙️ Engine Specifications

Engine Type:

2-Stroke, Air-Cooled

Displacement:

Approximately 123cc (specific value to be confirmed in manual)

Bore X Stroke:

Details to be found in the manual, typical for this class.

Horsepower:

Estimated 10-15 HP (specific figures to be confirmed in manual)

Torque:

Details to be found in the manual.

Carburetor Type:

Likely a single Mikuni or similar carburetor (specific model and jetting details in manual)

Fuel Mixture:

2-stroke oil/fuel mixture ratio (e.g., 50:1 or 100:1) as specified in the manual.

🔧 Transmission

Transmission Type:

5-Speed Constant Mesh

Clutch Type:

Wet Multi-Plate

Gear Ratios:

Specific gear ratios for each speed will be detailed in the manual.

Final Drive:

Chain Drive

📐 Dimensions

Overall Length:

Details to be found in the manual.

Overall Width:

Details to be found in the manual.

Seat Height:

Details to be found in the manual.

Dry Weight:

Likely around 100-115 kg (specifics in manual).

Fuel Tank Capacity:

Typically 10-13 liters for this class (specifics in manual).

🛡️ Safety Features

Crash Test Results:

Not applicable or available for this vintage motorcycle model.

Braking System:

Front and rear drum brakes (typical), potentially a front disc on later variations. Manual will detail operation and maintenance.

Lighting System:

Headlight, taillight, brake light, and turn signals (if equipped) are crucial for visibility. Manual covers electrical checks.

💡 Technology Features

Instrument Cluster:

Analog speedometer, tachometer (if equipped), odometer, and indicator lights. Manual details functionality and troubleshooting.

N A:

N/A - This motorcycle predates modern driver assistance systems.

N A:

N/A - No electronic connectivity features.

🔧 Maintenance

Oil Change Interval:

Detailed in the manual, typically based on mileage or operating hours. For 2-strokes, proper 2-stroke oil is critical.

Spark Plug Replacement:

Intervals specified in the manual, depending on plug type and usage.

Chain Adjustment Lubrication:

Regular checks and lubrication are essential for longevity, intervals will be in the manual.

Engine Oil Type:

2-stroke motorcycle oil meeting specific JASO standards (e.g., JASO FB or FD) as per manual recommendations. Not a typical crankcase oil system.

Transmission Oil Type:

Hypoid gear oil (e.g., SAE 80W-90) or specific Yamaha transmission oil. Capacity and change intervals in the manual.

Brake Fluid Type:

DOT 3 or DOT 4 brake fluid if equipped with hydraulic brakes. Manual will specify.

Common Wear Items:

Piston rings, clutch plates, fork seals, carburetor jets, and electrical connections are common wear items on vintage 2-stroke motorcycles.

Carburetor Clogging:

Fuel varnish and deposits can cause carburetor clogging, requiring regular cleaning and maintenance. Manual details this.

📚 Vehicle History

Yamaha Motorcycles:

Yamaha has a long history of producing reliable and performance-oriented motorcycles, often excelling in the lightweight and mid-size segments.

Rx Series:

The RX series was known for its sporty styling and peppy 2-stroke engines, popular in many global markets for their performance and agility.

Manufacturing Location:

Likely manufactured in Japan, with potential production in other Yamaha facilities globally.

🏆 Awards & Recognition

Model Reputation:

While specific awards for the RX125 might be elusive, the Yamaha RX series generally held a reputation for reliability, performance, and fun in its class during its production era.