The service manuals are copyright
But anyway there is usally a rubber plug on the motor housing that lets a screwdriver reach the drain screw for the carb bowl.
It does NOT have to be removed only opened a few turns as it has a drain hole drilled in it for this
I use some paper towles so the fule does not get into the water .
Pretty much any new motor has this issue as to meet the new 3 star EPA rules there really LEAN