Not good for racing. It is called vari-drive. This question has been gone over
several times. All you do is burn belts off, and the ratio is way too low.
Search 600 or 820 pearless, those are the way to go, if you
are going to race transaxles. Peerless 700 or 350/400 if you
want to use a cart axle. I know some guys who made it through the season
with another transaxle, but some needed 3 of them, for a 15 race schedule.
Do some research, and see where you want to go.
Marc