If we have a Wizard roto tiller is the engine briggs and stratton?

The motor plate should tell you.

Hi,
There will be numbers stamped into the housing near the spark plug. Generally if they bagin with a number, like 130202, they are Briggs. If they begin with a letter like H50, that would beTecumseh. If it is an older machine, that should cover it.
Peace,
Clarke