1986-1987 Yamaha TT225 / TT225S Service Manual

Yamaha TT225S Technical Reference

• Covers 1986–1987 Yamaha TT225S off-road motorcycles, including specific data for the engine, chassis, and electrical system tuning
• Official Yamaha publication P/N LIT-11616-05-18, first edition November 1985
• Contains 21 illustrated symbols for maintenance, 14 electrical/fluid specification tables, and expanded engine overhaul diagrams for the 1RH-series powerplant
• Delivered as a direct download the moment payment clears
• Full-text search finds any part number in seconds
• Laid out for standard letter and A4 printing
• This 1985 first edition serves as the foundational documentation for the initial TT225S model release, defining factory tolerances and assembly procedures for the 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 identification markers, including vehicle and engine serial number prefixes, alongside a list of required specialized service tools. The subsequent maintenance section outlines periodic inspection intervals, fuel system upkeep, brake system adjustments, and chain tensioning procedures essential for consistent performance.

Factory Specifications and Assembly Data

This Yamaha TT225S publication documents critical assembly dimensions, clearance limits, and torque settings for the engine overhaul and transmission sections. The data section provides vital specs for valve adjustments, compression limits, and fork oil levels to maintain how factory workshop documentation is structured on the original build. Intake valve clearance is set at 0.05–0.09 mm in the cylinder head specification table. Compression pressure for the 1986 Yamaha TT225S is documented at 1,177 kPa at sea level. The primary reduction ratio for the engine is listed at 3.318 in the inspection reference table. Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions. An official 100-page Yamaha OEM workshop manual covering the 1986–1987 TT225S, documenting engine, chassis, electrical, and fuel-related specifications for the 1RH-series build.