I know a guy who's dad did the same thing, only it was with a go-cart. But in the interest of full disclosure the go-cart was running a 80ci harley motor with a hand shift/clutch with 15" 60 series tires on the back. He used to love suckering people, you think that car is fast? My go-cart would beat it...Then he got an Anglia and raced it until his son starting driving. He sold it because it was so squirrely and he didn't want his son to wreck/die in it.
Nice mini bike