Ok that’s funny! I vote 4HP Briggs! When I was a young aspiring gear head me and a buddy built a go kart around a 4 HP Briggs. Swear that thing would go an easy 100mph. Down side we did not install brakes for test drive. Kind of like an open header blast around town on a fresh rebuild. I crashed it into the side of the barn and it caught on fire. To a farm kid a barn fire is very very bad. I was wearing my prize possession Bart Starr jersey and had to put flames out with it. I was crushed.