so last year i had a 78 cb550k i bought restored,then i purchased a $300 parts bike complete that was a 78 cb550k also which i decided to fix up into a different style bobber/chopper,blew the head on it and possibly the motor cause of a bent and broken valve punched a hole through #1 piston,now i have purchased a new parts bike complete also to use the motor for my bobber plus extra parts.Now i just have to find time to go and pick it up after this -40 weather warms up here in edmonton,Ab. These damn bikes sure are addictive and fun to work on though.