I had the same thing about a year ago. I was running at WOT and then started loosing power. At that time there was a loud bang, clank, pop or what ever you want to call it and then nothing. It took me a little bit to get it out of gear then it started and idled fine. The shifter moved fine but it would not go into gear. After taking it to the mechanic, he told me that the inner or uppper seal blew on the lower unit and thus leaked all the lube out and locked up the gear case snapping the drive shaft. they replaced the entire lower unit and shaft. Thank goodness for warranties. 05 225 Pro XS Hopefully this helps. Ron S