1988 Yamaha TDR 250 Service Manual (P/N 3CK-28197-20)

• Covers the 1988 Yamaha TDR 250 and the 239cc TDR 240 French market variant, including specific model-code builds 3CK and 3CL.
• Official 110-page Yamaha factory publication (P/N 3CK-28197-20) issued directly for the launch year.
• Contains 8 detailed exploded-view diagrams within the maintenance chapters and 21 technical specification tables.

Factory Documentation Overview

The 1988 Yamaha TDR 250 service manual provides a structured breakdown of the parallel-twin's mechanical and electrical systems. Navigating the unique setup of the TDR series requires accurate factory data, and this guide details chassis and engine serial number identification before diving into the exact special tools necessary for tune-ups and case splitting. Dedicated sections cover periodic inspection, engine overhaul, cooling systems, carburetion, and electrical circuits. The included systematic troubleshooting charts help technicians diagnose faults quickly during routine bench work. When working on vintage high-performance two-strokes, always adhere strictly to standard workshop safety protocols and handle fuel systems in well-ventilated areas.

Engine and Chassis Specifications

Accurate tolerances are critical when rebuilding the TDR. The manual outlines essential maintenance limits for cylinders, pistons, rings, and the crankshaft assembly. It specifies the engine oil pump capacity at 1.4 liters and the transmission oil change requirement at 1.0 liter. For the top end, the cylinder head bolt torque is documented at 22 Nm (16 ft-lb). Tune-up data defines the ignition timing at 19° B.T.D.C. at 1,200 r/min, alongside exact intake valve clearance and reed valve stopper heights for dialing in the powerplant.