A 137 track under a 2016 STX DX puts the machine in the same service volume as the rest of the Viper line. The book is LIT-12618-03-26, and your sled is identified as SR10SD37GR.
Track and skid work, drive clutch service, engine teardown with torque sequences, fuel and ignition diagnosis, and the complete wiring diagram are all here, together with the maintenance schedule Yamaha specified for the season.
Because the same manual answers for the 146 DX, the MTX lengths, LTX, RTX and XTX trims, some chapters describe more hardware than sits on your chassis. The specification tables sort that out: find the column headed with your model code and the figures for a 137 DX follow. It takes a moment longer than a single-model book but it keeps every 2016 Viper procedure in one place.
