Originally Posted by
adriang79
I managed to squeeze a 23t onto it, but certainly won't fit anything more than that.
My motor mount is currently with a friend who has a milling machine to have the motor screw holes made a little bit longer, hopefully fit another tooth or two on the pinion.
Get a Kimbrough 69 tooth spur. The limiting factor for gearing is the size of the spur and the 72 is just too big.