Yamaha IT 400 (1980 – 1983) – range model codes YAMAHA MANUALS Range model codes for 1980-1983 Yamaha IT 400. Yamaha IT 400 (1980 - 1983) - range model codes download Post navigation Previous Previous post: Yamaha IT 250 K (1983) – spare parts catalogue (EPC)Next Next post: Yamaha IT 400 C (1976) – spare parts catalogue (EPC)