90 hp for an mx bike is waaaaaaaay to much power. 65 70 hp max to get the job done,on a banshee all that extra money should be spent on suspension.you would have to be one big mofo to be able to throw around a heavy ass banshee with 90 hp worth of balls on an mx track.i used to take my banshee to a track every weekend with an mx port, pushing 65 hp.shee would throw me around,suspended and all,wide axle.