2005–2006Yamaha TT-R125 Workshop Manual (P/N 1B2-F8199-81)
Yamaha Models Covered & Key Technical Specifications
Models: Yamaha TT-R125, Yamaha TT-R125E, Yamaha TT-R125LW, Yamaha TT-R125LWE
Sub-models / Variants: 2005–2006 models (model version V), standard and electric start configurations, LW (large wheel) variants
Model Years: 2005–2006
Serial Numbers: Model codes 1B29, 1B2A, 1B2D, 1B2E, 1B2B, 1B2C, 1B2F, 1B2G
Technical Data:
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Engine type: 4-stroke, air-cooled, SOHC, single cylinder
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Engine displacement: 124 cm³ (7.57 cu in)
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Bore and stroke: 54.0 × 54.0 mm
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Compression ratio: 10.0:1
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Transmission: 5-speed constant mesh, left foot operated
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Fuel system: Mikuni VM20SS carburetor
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Pickup coil resistance: 248–372 Ω at 20 °C
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Charging system capacity: 12 V/3.2 AH battery (E-start models)
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Cylinder head bolt torque: 22 Nm (M8), 10 Nm (M6)
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Piston-to-cylinder clearance: 0.020–0.026 mm
Yamaha Manual Features & Content Preview
- Covers 2005–2006 Yamaha TT-R125, TT-R125E, TT-R125LW, and TT-R125LWE off-road motorcycles, including both electric and kick-start variants.
- Original OEM publication P/N 1B2-F8199-81, 1st edition (May 2005).
- Contains 56 individual torque-specification tables and highly detailed electrical schematics for the ignition and charging systems.
- Details the specific baseline standards for the 1B2-series platform release, documenting the original factory geometry and engine assembly specifications.
Manual Content Overview
This official 610-page Yamaha OEM workshop manual provides an extensive breakdown of all service requirements for the TT-R125 platform. Divided into six logical chapters, the document starts with general maintenance intervals and VIN identification markers for the 1B2-series codes. From there, it dives deep into technical specifications, inspection schedules, and engine teardown procedures. You will also find exact chassis configurations, suspension settings, and electrical component testing methods for both standard and electric-start setups.
Because this manual is an instant download, you can immediately pull up the necessary wiring diagram on your shop tablet or print specific pages right at your workbench.
When maintaining off-road motorcycles, always verify current torque values and ensure the engine is fully cooled before servicing components to prevent personal injury or hardware damage.
Specification and Reference Data
The technical data sections deliver the exact tolerances required for professional shop work. It covers critical engine component specs, including camshaft runout, valve seat widths, and piston clearances. The engine assembly section clearly documents tightening requirements, such as the exact 22 Nm specification for cylinder head bolts.
Electrical troubleshooting is straightforward thanks to accurate baseline figures. For instance, the TT-R125 magneto pick-up coil resistance is documented at 248–372 ohms, while the battery capacity for electric-start models is rated at 3.2 AH. Understanding factory maintenance manuals is much easier when you have direct access to clear torque indexing and wire-harness continuity checks without having to guess the factory values.
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