Upd — Y16zr Service Manual

The Y16zr uses a high-pressure fuel pump (rated at 45 psi). Old manuals mistakenly listed a lower pressure. Using the incorrect spec leads to lean misfires. The version provides the correct fuel pressure regulator test using a specialized adapter (Yamaha Part #90890-03179).

Finding a comprehensive "service manual" for the Yamaha Y16ZR (T155) Y16zr Service Manual UPD

Keeping Your Beast in Top Shape: The Yamaha Y16ZR Maintenance Guide The Y16zr uses a high-pressure fuel pump (rated at 45 psi)