Save money on repair and maintenance jobs. This manual covers Yamaha snowmobiles including, Phazer PZ480 1984 89 and EX570 1987 89 . It has chapters on troubleshooting, lubrication, maintenance, tune-up, high altitude and rear suspension adjustment, engine overhaul, carburetor and fuel pump, electrical and oil injection, cooling system, drive system sheave service procedures and removal, front suspension and skis, track and cleat service and repair, off season storage and much more. This manual has step by step instructions for each repair procedure, complete with multiple illustrations. There are wiring diagrams and specification charts , plus many great tips on types of tools, fasteners, and specialty chemicals used in maintenance. Not only save money on repairs, but know that it was done correctly. With 448 pages it is all in this manual.