I bought my first motorcycle a few days ago (will post the promised pics soon!) but I noticed that the nozzle of the fuel station goes quite deep into the tank, so if it shuts off automatically, my tank is only half full.

From cars I know you shouldn't fill up further after it automatically shuts off, but they don't have this issue, so...

The question is, how do I know how much fuel I can put in the tank, without damaging anything (short or long term)?

Edit: thanks for the responses, since the bike is more than 20 years old, I don't haave the manual. But just filling it up as full as possible while the lid can still close comfortably seems to work just fine