help me out? Here is my problem. At the dam run i took the boat out about a hour before and ran a 62.4 gps going up river . picked up a mel and a two of his freinds and could not get the boat over 50. I ordered the scan tool for the 496 ho since i can not get my boat in to a shop before the end of the month. no fault codes where thrown. everything appears to e o.k. but i lost 10 mph. all so i pulled the prop off and that black plastic sleeve had a hair line crack . could this be the problem. HELP.