Segment:
Lightweight off-road/trail motorcycle
Target Audience:
Beginner to intermediate riders, trail enthusiasts, recreational off-roaders
Competitors:
Honda CRF150F, Kawasaki KLX140, Suzuki DR-Z125
Versatility:
Suitable for trail riding, play riding, and entry-level competition
Reliability:
Known for Yamaha's robust engineering and durability
Ease Of Use:
User-friendly design for learning and enjoyment
Applicable Years:
1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
Trim Levels Covered:
All standard TTR125 models (E, L, LE, LC where applicable by year)
Estimated Pages:
Hundreds (typical for a comprehensive workshop manual)
Type:
Digital Workshop Repair Manual
Format:
Digital (likely PDF or similar e-book format)
Engine:
Complete engine overhaul, diagnostics, performance tuning, component replacement (cylinder, piston, crankshaft, valve train, etc.)
Transmission:
Gearbox inspection, repair, clutch system, shift mechanism
Fuel System:
Carburetor service, fuel tank, fuel lines, fuel pump (if applicable)
Ignition System:
CDI unit, spark plug, ignition coil, wiring diagrams
Electrical System:
Wiring harnesses, lighting, battery, charging system, starter motor, troubleshooting diagrams
Suspension:
Front fork service, rear shock absorber inspection and replacement, linkage maintenance
Brakes:
Front and rear brake system service, caliper overhaul, pad replacement, fluid bleeding, linkage inspection
Cooling System:
Air cooling system inspection and cleaning
Exhaust System:
Muffler and pipe inspection, gasket replacement
Chassis And Frame:
Frame inspection, component mounting, bearings
Wheels And Tires:
Tire pressure, rim inspection, spoke tensioning, wheel bearing service
Maintenance:
Routine servicing, oil changes, filter replacements, lubrication, chain adjustment, periodic inspections
Troubleshooting:
Diagnostic guides, fault finding procedures, common problem identification
Repair:
Step-by-step instructions for component removal, installation, and repair
Rebuild:
Comprehensive instructions for engine and transmission rebuilds
Restoration:
Guidance on refurbishing and restoring older models
Diagnostics:
Electrical system diagnostics, engine performance diagnostics
Depth:
Comprehensive (covers basic to advanced repairs and rebuilds)
Detail Level:
Factory-level detail with diagrams and specifications
Engine Type:
Four-stroke, SOHC, air-cooled
Displacement:
124 cc (approximately)
Bore X Stroke:
54 mm x 54.5 mm (typical, check specific model year)
Compression Ratio:
9.5:1 (typical, check specific model year)
Horsepower:
Approx. 10-12 HP (estimated, varies by year and tuning)
Torque:
Approx. 7-8 lb-ft (estimated, varies by year and tuning)
Carburetor Type:
Mikuni VM20 (typical, may vary)
Fuel Capacity:
2.4 L (0.63 US gal, approximately)
Fuel Type:
Unleaded gasoline
Length:
Approx. 1835 mm (72.2 in)
Width:
Approx. 790 mm (31.1 in)
Height:
Approx. 1070 mm (42.1 in)
Seat Height:
Approx. 830 mm (32.7 in)
Ground Clearance:
Approx. 275 mm (10.8 in)
Dry Weight:
Approx. 80 kg (176 lbs)
Wet Weight:
Approx. 87 kg (192 lbs, with fluids and full tank)
Gross Vehicle Weight Rating Gvwr:
Not typically specified for off-road motorcycles, but user weight limit applies.
Crash Test Ratings:
N/A (Not applicable to off-road motorcycles designed for controlled environments)
Braking System:
Front: Drum brake (early models) or Disc brake; Rear: Drum brake
Tire Type:
Knobby off-road tires
Lighting:
Headlight, taillight/brake light (may vary by model designation like 'E' for electric start/lights)
Frame Construction:
Steel, tubular, semi-double cradle frame for durability
Oil Change Interval:
Every 1000 km (600 miles) or 6 months (typical, refer to manual for exact specification)
Air Filter Cleaning:
Every 500 km (300 miles) or as needed based on conditions
Spark Plug Inspection:
Every 1000 km (600 miles)
Chain Lubrication Adjustment:
Every 500 km (300 miles) or after washing/riding in wet conditions
Engine Oil Type:
Yamalube 4 (or equivalent SAE 10W-40 API SG or higher)
Engine Oil Capacity:
0.90 L (0.95 US qt) without filter change, 1.00 L (1.05 US qt) with filter change
Brake Fluid Type:
DOT 3 or DOT 4
Common Wear Items:
Clutch plates, brake pads/shoes, chain and sprockets, air filter, seat cover, plastic body panels.
Carburetor Tuning:
May require occasional adjustment due to altitude or modifications.
Suspension Seals:
Front fork seal leaks can occur with heavy use; manual provides seal replacement procedures.
Heritage:
Yamaha has a long-standing reputation for performance and reliability in off-road motorcycles, with a strong presence in motocross and enduro.
Introduction:
The TTR series was developed to offer accessible and capable off-road performance for a wider range of riders.
Key Updates:
Over its production run, the TTR 125 saw minor updates including improvements to suspension, braking (transition from drum to disc front), and styling.
Manufacturing Location:
Japan (typically for Yamaha's core models)
Production Period:
1999-2006 (as covered by this manual), with successor models continuing the lineage.
Awards:
While specific awards for the TTR 125 are not widely publicized, it is consistently recognized for its value, ease of use, and reliability in the beginner off-road segment.
Reliability Rating:
Generally high, reflecting Yamaha's reputation.
Emissions:
Meets relevant emissions standards for its production era.
