hey glenn,
you have had the same problem as one guy in my club, 3 blown powerheads in a short time and Yamaha did not want to cover anything, my advice to the buyer is go with Mercury or E-tec, more guys I know are ordering E-tec's for there 3 yr no maintence and 7 yr warranty. Cant beat that. I have yam 200 and dont know whether to try to trade in for E-tec or sweat out