There is a 65t spur that I think is made for the moster pirate (whatever that is).
It does have to be moddified a little bit to fit.
If you are using the stock motor plate you will probably need to drill a new hole or new slot in it (the motor plate) for the top motor screw, because the big spur will cause the motor to be so far away from the transmission it will be past the origonal slot.