i think ive mentioned before my dad is a mechanic so ive rebuilt car, motorcycle, and lawnmower motors my hole life. so when my buddies 15hp evinrude blew on us last year cause the water pump went out. i told him i could rebuild it. now some things are a little different, thats why i from time to time seek bubbakat and bobpauls advice. but i have had some realy bad luck with this motor. first time it had to be bored, so the guy got the block bored fine, but when refacing he grinded it lopsided. so when i got it all back together it ran fine, untill the piston got beat down to the ring. so we got another block, new standard pistons and rings and i put it back together again. did the 10 hr breakin and everything like supposed to. everthing seemed great. well we took her out today, about 1 mile down the river it made an awefull racket. so after getting it home found it wasnt in the work i did but the lower unit for some reason locked up. i took it off and it wont turn a lick. the real bad thing is i think when it lock it broke a rod in the top half. is this just bad luck or could i have done something to the top half to cause the bottom half to freeze up.