Ive started building a go cart out of some scrap metal and lawn mower parts. Im almost done, i just need to get another spool of wire for my welder so i can make a mounting plate for the motor. i was wondering how fast it might go. im putting a 2 cylinder 18 horsepower briggs on it with a 5 inch pulley on the motor and a 3 inch pulley on the axle.