My guess is that it's not allowed this year. The motor that is listed in the 2015 list of allowable motors is
http://banebots.com/p/M7-RS775-18
so maybe it would be wise to order one, as well as the appropriate pinion gear
(it's possible that the motor you have is the right one, but does not have the appropriate BaneBots label, and since BaneBots does not list the actual motor part number, it's hard to verify)