I thought that the xstar and larger boats used the 14.25 x 14 while the smaller boats used the 14.25 x 14.5.
Look on the center of the prop and see what size it is. It is stamped around the shaft. If it is the 14.25 x 14.5, you could go down to the 14.25 x14 to give you more power coming out of the hole but you will give up top speed.
(Message edited by 1boarder_kevin on November 15, 2007)