1984 Yamaha IT490(L) / IT250(L) Owner's Service Manual

Yamaha IT490 IT250 1984 Service Manual

• This 1984 Yamaha IT490 and IT250 service publication supports maintenance and technical oversight of the 29V-series enduro models including the 487 cc and 246 cc two-stroke powerplants
• Official Yamaha publication 29V-28199-70, 1st edition published July 1983
• Contains 80 high-resolution pages with technical diagrams, exploded views, and electrical wiring schematics
• Delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Note: This page is a contents overview for the manual. It does not provide repair or diagnostic instructions.
• This 1983 first edition serves as the original baseline document for all 1984 Yamaha IT490 and IT250 production units

Document Scope and Technical Data

Yamaha IT490 IT250 Coverage

The 1984 Yamaha IT490 and IT250 owner's service manual provides essential operational and maintenance parameters for these enduro machines. Primary chapters detail engine maintenance, chassis upkeep, and electrical systems, while the appendix provides a troubleshooting guide for ignition, compression, and fuel system concerns. The manual includes specific data for both the 490 cc and 250 cc variants, covering major component inspections and general tuning.

Specification Highlights

Engine maintenance data is central to the publication, with piston clearance listed at 0.070–0.075 mm for the Yamaha IT490. Transmission oil capacity for periodic changes is documented at 0.75 L. The ignition timing for the 1984 Yamaha IT490 is specified at 2.00 mm B.T.D.C. in the engine specification tables. Reference this factory workshop manual for detailed torque specifications including the 75 Nm value for the primary drive gear nut. Reference only — always consult a certified technician before performing service on this equipment. An official 80-page Yamaha OEM owner's service manual covering the 1984 Yamaha IT490 and IT250, documenting engine, chassis, and electrical maintenance specifications for the 29V and 45-series production models.