Awhile back i saw a abanded riding mower in somones yard and i went to look at it to see what motor was in it.It was a briggs.And actually there was a pulley or 2 up front from the engine running back to the rear end and the blades.Go to a mower repair shop or go online and look at some of the parts schematics and youll see that theres some that have the belts twisted all sorts of ways to make them work at different angles.