We do not do offroad mowers, a predator 212 is not a common motor used in mower racing.
Things are slow right now, and the mass of members are not around to answer questions.
Do a search on 212 and see what you come up with. Maybe you could send a message to one
of the members who use them in one of the few clubs that may use that motor.
Go-karts use this motor as well as some mini bikes guys. You may want to try one of those sites
to help dial in your setup.