Description This 120 page 1978-1981 Yamaha Enticer ET250 Snowmobile Factory Service Manual provides detailed service information, step-by-step repair instruction and maintenance specifications for 1978, 1979, 1980, and 1981 Yamaha Enticer ET250 Snowmobiles. 2016 Mazda Tribute Auto Manual download free. This is a high quality reproduction of the original, out of print, book and includes wiring diagram. Hard Dollar User Manual download. 1978-1981 Yamaha Enticer ET250 Snowmobile Service Manual Table of Contents Chapter 1 – General Chapter 2 – Periodic Inspection And Adjustment Introduction Maintenance Intervals Charts Engine Drive Chassis Electrical Chapter 3 – Disassembly Inspection Reassembly Adjustment Disassembly Engine Drive Body Inspection, Reassembly And Adjustment Engine Drive Body Electrical Chapter 4- Appendix Chapter 5- Et250 B Supplement Chapter 6 – Et250 C Supplement Chapter 7 – Et250 D Supplement.