1978-1982 Yamaha IT250 / IT465H Owner's Service Manual

Yamaha IT250 and IT465H Service Documentation

• Covers 1978–1982 Yamaha IT250 and IT465H enduro motorcycles, including model-specific engine, suspension, and chassis tuning configurations
• Official Yamaha publication P/N 5L4-28199-20, first edition December 1980
• Contains 16 technical exploded-view diagrams, 2 wiring schematics, and consolidated torque specification tables
• File delivered as a direct download the moment payment clears
• Indexed PDF search covers every chapter and appendix
• Suitable for printing individual sections for shop-floor use
• This 1980 edition provides the baseline service data for the IT-series evolution, documenting unique specifications for the 250cc and 465cc engine variants

Manual Content Summary

This Yamaha service publication delivers specialized maintenance data for the IT250 and IT465H enduro series. The documentation outlines fundamental machine identification, pre-operation safety checks, and essential engine service intervals required for off-road competition. Detailed chapters address carburetor tuning, air induction systems, and internal transmission components, alongside specialized sections on steering head maintenance and drive chain alignment. The content focuses on sustaining optimal power delivery and mechanical integrity through routine adjustment schedules.

Specification and Technical Preview

Technical sections document critical reference values, including carburetor float heights, ignition timing, and piston ring end gaps. Detailed tightening torque tables provide specific values in both Nm and m-kg for engine, chassis, and suspension components, ensuring accurate assembly. Electrical reference values for CDI components, including pulser coil and stator resistance, are provided for diagnostic troubleshooting. Reference how factory workshop documentation is structured to confirm your maintenance workflows align with original equipment standards.

Note: All service data shown here is for reference only — qualified technicians and the original OEM documentation remain the authoritative source for any hands-on work. This official 73-page Yamaha OEM service manual covers the 1978–1982 Yamaha IT250 and IT465H, documenting engine, chassis, electrical, and fuel-induction specifications for the 5L4 and 5L5 series builds.