Use the cold pressures specified by the motorcycle manufacturer as the starting point. They account for the motorcycle, tyre sizes and intended load better than a generic number shared online.
Pillion and luggage recommendations may differ from solo settings. Measure before riding, because pressure rises as the tyre warms and a hot reading is difficult to compare with a cold specification.
Persistent pressure loss deserves inspection. Air is cheaper than tyres, but neither fixes a puncture, damaged valve or bent rim by itself.
