Target Audience:
Owners and independent repair shops specializing in off-road motorcycles.
Value Proposition:
Provides essential, in-depth technical knowledge to maintain and repair the TTR125, saving costs on professional servicing.
Diagrams Illustrations:
Includes detailed diagrams and step-by-step illustrations for visual guidance.
Specifications Tables:
Features comprehensive tables for torque values, clearances, fluid capacities, and electrical specifications.
Engine System:
Complete engine disassembly, assembly, inspection, and repair procedures for the 125cc engine.
Fuel System:
Carburetor overhaul, adjustment, troubleshooting, fuel tank, fuel lines, and petcock.
Ignition System:
CDI ignition system components, troubleshooting, and timing checks.
Transmission System:
Clutch operation, inspection, and replacement; gearbox disassembly, inspection, and reassembly.
Suspension System:
Front fork disassembly, seal replacement, oil level and type specifications; rear shock absorber inspection and adjustment.
Braking System:
Front and rear brake system inspection, pad replacement, fluid flush and bleed procedures, lever and pedal adjustment.
Electrical System:
Wiring diagrams, lighting system, battery maintenance, starter system, fuses, and troubleshooting.
Cooling System:
Air-cooled engine specifications and maintenance.
Frame And Bodywork:
Chassis inspection, plastic panel removal and installation, seat, handlebars, and footpegs.
Wheel And Tire System:
Wheel bearing inspection and replacement, tire pressure recommendations, spoke tension.
Routine Maintenance:
Oil change procedures, air filter cleaning/replacement, spark plug inspection/replacement, chain adjustment and lubrication.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting for common issues.
Rebuilding Procedures:
Detailed instructions for engine internal component rebuilds (e.g., piston, rings, valves).
Adjustment Procedures:
Carburetor idle and mixture adjustments, clutch and throttle cable free play adjustments.
Diagnostic Capability:
Advanced diagnostic procedures for electrical and mechanical issues.
Repair Scope:
From minor adjustments to major component overhauls and replacements.
Special Tools:
Identification and usage of specialized tools required for certain procedures.
Engine Type:
4-Stroke, SOHC, Air-Cooled
Bore X Stroke:
54mm x 54.5mm (typical, confirm with manual)
Compression Ratio:
9.5:1 (typical, confirm with manual)
Horsepower:
Approx. 10-12 HP (subject to tuning and variant)
Torque:
Approx. 6-7 lb-ft (subject to tuning and variant)
Carburetor Type:
Mikuni VM series (e.g., VM20 or similar)
Fuel Type:
Unleaded gasoline
Ignition Type:
CDI (Capacitor Discharge Ignition)
Engine Oil Change:
Every 1000 km or 6 months, whichever comes first (recommended).
Air Filter Cleaning:
Every 500 km or as needed, depending on riding conditions.
Spark Plug Inspection:
Every 1000 km.
Valve Clearance Check:
Every 5000 km (check manual for exact interval).
Engine Oil Type:
Yamalube 4 (or equivalent) SAE 10W-30 API Service SG or higher.
Engine Oil Capacity:
Approx. 1.0 L (1.05 US qt) when filter is replaced, 0.9 L (0.95 US qt) without filter replacement (confirm with manual).
Fork Oil Type:
Yamaha Suspension Fluid (or equivalent) SAE 10W (confirm with manual for exact type and quantity).
Carburetor Jetting:
Can sometimes require re-jetting depending on altitude and modifications for optimal performance.
Clutch Wear:
Clutch plates may wear over time with aggressive use; manual covers inspection and replacement.
Chain And Sprockets:
Regular lubrication and adjustment are crucial to prevent premature wear.
Oil Filter Part Number:
Specific part numbers for filters and other consumables are found within the manual.
Yamaha Motorcycles:
Yamaha Motor Corporation, established in 1955, is a global leader in motorcycle manufacturing, known for innovation and performance across various segments.
Ttr Series:
The TTR series represents Yamaha's line of trail-oriented dirt bikes, designed for versatility and rider enjoyment on varied terrain.
Ttr125 Introduction:
The TTR125 was introduced in 1999 as a new model in Yamaha's off-road lineup, bridging the gap between smaller playbikes and larger competition models.
