I don't think the briggs came on it but the install was professional,started life as a 5 horse but after they add all the roller bearings and stuff they do I have no clue but learning as I go,I had some homemade ones in the past too and also had a kewl twin engine one when I was younger that mom bought me but the most I ever had on it was a single 3 1/2 horse on it but it was fast and handled like it was on a rail and I was a small kid so I could catch the faster carts on the long haul