1991 Yamaha XT225-C (D-G) Service & Repair Manual (P/N LIT-11616-XT-25)

This official 371-page Yamaha publication (P/N LIT-11616-XT-25, 1st Edition, June 1991) serves as the primary technical reference for the 4BE-series build. It thoroughly covers the 1991 Yamaha XT225D and XT225DC variants, including US-market non-California, US-California, and Canadian-market configurations. Organized into eight major sections, the documentation provides the exact exploded-view diagrams, comprehensive electrical schematics, and factory torque specifications required for professional maintenance.

Manual Content and Structure

The service manual breaks down into distinct chapters covering general information, routine maintenance, engine overhaul parameters, carburetion, chassis components, electrical systems, and troubleshooting. Each section lists specific service tolerances, lubrication routing diagrams, and strict inspection criteria. These details are essential for correctly maintaining the 4-stroke SOHC engine and the diamond-frame chassis geometry. For technicians working on the XT225DC California-only model, the manual details specific emission control system maintenance. This includes precise canister and hose routing references to ensure emissions compliance without guesswork.

Technical Specification Highlights

General engine specifications outline the 223.21 cm3 displacement and a 9.5:1 compression ratio for the forward-inclined single cylinder. The factory data lists critical assembly torque values. You get the exact numbers needed for internal components, like the 50 Nm required for the AC generator rotor and the 60 Nm specification for the cam sprocket bolt. Please observe standard workshop safety protocols and verify all torque values and clearance measurements during any major engine teardown to prevent component failure.

Electrical system depth is significant. The manual provides highly specific reference values for the CDI unit, noting pickup coil resistance at 656–984 ohms at 20°C and charging coil resistance at 584–876 ohms at 20°C. In the cylinder head specification table, intake valve clearance is listed strictly at 0.05–0.09 mm. Since this is an air-cooled unit, coolant system data does not apply. Total oil capacity is properly documented at 1.1 liters following a routine filter replacement.