1986-1987 Yamaha TT225 / TT225S Factory Service & Repair Manual (P/N LIT-11616-05-18)

• Official 100-page Yamaha OEM publication (P/N LIT-11616-05-18, first edition Nov 1985) covering the 1986–1987 Yamaha TT225S
• Contains 21 illustrated symbols for maintenance, 14 electrical/fluid specification tables, and expanded engine overhaul diagrams for the 1RH-series powerplant
• Defines factory tolerances and assembly procedures for period-correct components

Detailed Technical Contents

The 1986–1987 Yamaha TT225S service manual provides a comprehensive look at the machine's internal mechanical functions. Chapter 1 establishes essential identification markers, including vehicle and engine serial number prefixes, alongside a required specialized tool list. The subsequent sections outline periodic inspection intervals, fuel system upkeep, brake adjustments, and chain tensioning procedures. Professional mechanics will find this reference invaluable for quickly verifying factory baselines during routine shop work. Always ensure your workspace is properly ventilated and adhere to standard safety protocols when handling engine fluids or compressed air.

Factory Specifications and Assembly Data

This publication documents critical assembly dimensions, clearance limits, and torque settings for the engine overhaul and transmission components. You get direct access to vital specs for valve adjustments, compression limits, and fork oil levels to match original factory tolerances. For instance, intake valve clearance is set at 0.05–0.09 mm in the cylinder head specification table. Compression pressure is documented at 1,177 kPa at sea level, and the primary reduction ratio for the engine is listed at 3.318. This documentation serves as a strict contents overview for the original build and does not function as a step-by-step repair guide. Instead, it delivers the raw data technicians and DIYers need to execute precision mechanical work.