🏷️ Basic Information

Make:

Yamaha

Model:

XT125R

Model Designation:

XT 125R BIKE

Product Code:

YAM-XT125R-WSM

👋 Introduction

Market Position:

The Yamaha XT125R is positioned as an entry-level dual-sport motorcycle, appealing to riders looking for an affordable, reliable, and versatile machine for light off-road use, commuting, and general recreational riding. It caters to younger riders or those new to motorcycling.

Competitive Analysis:

Competes with other 125cc dual-sport and trail bikes from manufacturers like Honda (e.g., CRF125F), Kawasaki (e.g., KLX125), and Suzuki (e.g., DR-Z125). Its focus on air-cooling and simplicity often makes it a robust and low-maintenance option.

Key Features:

User-friendly 125cc engine, accessible seat height, capable suspension for mixed terrain, lightweight and nimble handling, reliable Yamaha build quality, straightforward mechanics.

📋 Manual Details

Manual Type:

Workshop Service Repair Manual, Owner's Manual, Parts Catalog

Page Count:

Estimated 300-500 pages (typical for comprehensive service manuals)

Language:

English

Format:

Digital (PDF)

📖 Manual Coverage

Engine:

Complete engine overhaul, tuning, disassembly, assembly, component testing, lubrication system, cooling system (air-cooled), valve train, ignition system, fuel system, exhaust system.

Transmission:

Gearbox disassembly, assembly, inspection, clutch operation, shift mechanism, lubrication.

Chassis:

Frame inspection, suspension (front forks, rear shock absorber), steering system, wheels, hubs, spokes, braking system (front and rear), brake fluid specifications, bleeding procedures, tire specifications.

Electrical:

Wiring diagrams, battery system, charging system (stator, regulator/rectifier), starting system (starter motor, starter clutch), lighting system (headlight, taillight, indicators), ignition coil, CDI unit, fuses, switches, instrumentation.

Bodywork:

Fairings, seat, fuel tank, fenders, mounting hardware, cosmetic component replacement.

Maintenance:

Recommended service intervals, oil change procedures, filter replacement (oil, air), spark plug service, chain adjustment and lubrication, brake pad inspection, tire pressure checks, general lubrication points.

Troubleshooting:

Diagnostic flowcharts for common starting issues, running problems, electrical faults, braking issues, and suspension performance.

Repair:

Detailed step-by-step repair procedures for all major components, including engine rebuild, carburetor overhaul, clutch replacement, suspension component servicing, brake caliper repair, electrical component replacement.

Adjustment:

Carburetor jetting and idle speed adjustments, clutch and throttle cable adjustments, suspension pre-load and damping adjustments (where applicable), chain slack adjustment.

Technical Depth:

Comprehensive, covering from routine maintenance and basic adjustments to complete engine and transmission rebuilds, electrical system diagnostics, and chassis component overhauls. Suitable for both amateur mechanics and professional technicians.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High-resolution scans of original factory documentation, ensuring clarity of text, diagrams, and illustrations. Optimized for digital viewing and printing.

Binding Type:

N/A (Digital Format)

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Engine Type:

Single-cylinder, 4-stroke, SOHC, air-cooled

Displacement:

123.7 cc

Bore X Stroke:

54.0 mm x 54.5 mm

Compression Ratio:

10.0:1 (Typical, subject to specific model year)

Valve Train:

SOHC, 2 valves per cylinder

Horsepower:

Approx. 10-12 HP (subject to specific model year and market regulations)

Torque:

Approx. 8-10 Nm (subject to specific model year)

Fuel Delivery:

Carburetor (e.g., Mikuni VM20SS or similar, subject to model year)

Fuel Type:

Unleaded gasoline

Oil Type:

SAE 10W-40 API SG or higher motorcycle-specific oil

Oil Capacity:

Approx. 1.0 - 1.2 Liters (with filter change)

Ignition System:

CDI (Capacitor Discharge Ignition)

Cooling Method:

Air-cooled

🔧 Transmission

Transmission Type:

Constant mesh, 6-speed

Clutch Type:

Wet, multi-plate

Final Drive:

Chain drive

Gear Ratios:

Refer to manual for specific gear ratios (e.g., 1st: 2.833, 2nd: 1.750, 3rd: 1.318, 4th: 1.083, 5th: 0.958, 6th: 0.840)

Transmission Oil Type:

Yamalube 4 (or equivalent API SE, SF, SG classification) SAE 20W-40

Transmission Oil Capacity:

Approx. 0.6 Liters

📐 Dimensions

Length:

Approx. 2050 mm

Width:

Approx. 830 mm

Height:

Approx. 1115 mm

Wheelbase:

Approx. 1340 mm

Ground Clearance:

Approx. 260 mm

Seat Height:

Approx. 820 mm

Dry Weight:

Approx. 116 kg

Wet Weight:

Approx. 124 kg (with all fluids and a full tank)

Fuel Tank Capacity:

Approx. 9.6 Liters (including reserve)

Front Tire Size:

80/90-21 M/C 48P (Tubed)

Rear Tire Size:

100/90-18 M/C 56P (Tubed)

Wheel Type:

Spoked

🛡️ Safety Features

Safety Ratings:

N/A (Motorcycles are not typically assigned NCAP or similar ratings)

Braking System:

Front: Hydraulic disc brake, Rear: Drum brake (early models) or Disc brake (later models, check specific year). Manual provides detailed inspection and service procedures for both.

Lighting:

12V Halogen headlight, taillight, brake light, turn signals.

Frame:

Steel diamond frame construction, designed for rigidity and durability in dual-sport applications.

Suspension Front:

Telescopic forks, ~200-220mm travel (typical for the class). Manual details inspection, seal replacement, and oil level checks.

Suspension Rear:

Monocross (single shock absorber) with adjustable pre-load. Manual covers adjustment, servicing, and replacement.

💡 Technology Features

Infotainment System:

N/A (Basic instrumentation: speedometer, odometer, neutral indicator, high-beam indicator)

Headlight Type:

12V 60/55W Halogen

Instrument Panel:

Analog speedometer and odometer, indicator lights for neutral, high beam, and turn signals.

🔧 Maintenance

Initial Service:

Typically at 600 miles (1000 km) for first service, covering oil change, filter check, chain adjustment, and bolt torque checks.

Regular Maintenance:

Recommended oil changes every 3000 miles (5000 km) or 6 months. Air filter cleaning/replacement every 3000 miles. Chain lubrication and adjustment every 600 miles. Spark plug inspection/replacement every 6000 miles. Valve clearance checks every 6000-12000 miles (refer to manual for exact intervals).

Engine Oil Specification:

SAE 10W-40 API SG or higher (e.g., Yamalube 4)

Brake Fluid Specification:

DOT 4 (for hydraulic disc brakes)

Coolant Specification:

Not applicable (Air-cooled engine)

Common Issues:

Carburetor jetting can be sensitive to altitude and modifications. Chain and sprockets wear can occur with aggressive use and improper maintenance. Some electrical connections may corrode over time in wet conditions. Fork seals can wear, leading to leaks. Clutch engagement might become less crisp with high mileage.

Recommended Checks:

Regularly check chain slack, brake pad wear, tire condition, and fluid levels. Inspect for oil leaks and loose fasteners. Clean air filter regularly to maintain engine performance.

📚 Vehicle History

Brand Heritage:

Yamaha has a long and distinguished history in motorcycle manufacturing, particularly in off-road and dual-sport segments with its iconic XT series, dating back to the 1970s. The brand is known for innovation, reliability, and performance.

Model Evolution:

The XT125R is part of Yamaha's XT lineage, which has evolved significantly over the decades. The 125cc models typically serve as an accessible entry point into the dual-sport world, with continuous updates to styling, emissions, and components to meet market demands and regulations.

Production Period:

The XT125R was produced through various iterations, with common production years spanning the early to mid-2000s and possibly into the late 2000s or early 2010s depending on regional markets. Specific year coverage should be confirmed based on the manual's content.

Manufacturing Location:

Typically manufactured in Japan or Yamaha's global production facilities.

🏆 Awards & Recognition

Awards And Recognition:

While specific awards for the XT125R may not be widely documented, Yamaha's XT line is historically recognized for its pioneering role in the dual-sport category and its reputation for reliability and affordability among entry-level riders.

Certifications:

Compliant with relevant emissions and safety standards for its respective model years and markets (e.g., Euro regulations for European markets).