Yamaha TT-R125(R) and TT-R125LW(R) 2002 Trail Bikes Service Manual (P/N 5HP-28199-84)

Instant Access to Factory Specs for the 124cc Engine Platform

• Covers 2002 Yamaha TT-R125(R) base models and the TT-R125LW(R) long-wheelbase variants.
• Official 510-page OEM publication (5HP-28199-84, First Edition, April 2002).
• Features 47 exploded-view diagrams, 10+ torque-check maps, and over 30 pages of maintenance tables.

Technical Documentation Scope

This factory-authorized manual delivers the precise data required to maintain and service the 2002 Yamaha TT-R125 series. It covers internal engine mechanics in detail, including cylinder head geometry, cam dimensions, and valve spring compression. You will also find comprehensive breakdowns of the clutch assembly, shift mechanism, and ignition system.

For the chassis, the text outlines adjustments and specifications for the telescopic front forks and monocross rear suspension. It clearly differentiates between the two models, detailing the standard drum brake setup alongside the front disc brake system unique to the LW edition. Wiring diagrams and electrical parameters are included to troubleshoot harnesses and ignition circuits accurately.

Specification Previews

The maintenance tables offer direct shop-floor reference points. For example, the M8 cylinder head bolts require exactly 22 Nm (16 ft-lb) of torque, and the intake valve clearance is set at 0.08–0.12 mm. Both models feature a 6.6-liter fuel capacity.

While this guide contains exact manufacturer data, proper mechanical training is essential; always consult a certified technician before undertaking critical service tasks to ensure the safe operation of your motorcycle.