thanks for clearing things up
i do apologize for trying to critisize? your screen name, was very childish on my part, but im glad you saw it how i was reading it, and it looked like you were saying we all had no clue.
i do agree the ultra motor would be a great upgrade to performance. i only tried to steer him in the direction i personally saw best fit for what seemed like someone trying to do this on a budget. after purchasing a 680 motor, clutching, pipes, carbs, eletronics, airbox, on and on and on, hes gonna be into it for alot more then a $500 rebuild. not to mention time and so forth. and the fact that my experience with buying a used motor is youre getting just that, a used motor. you dont know the history, unless youre buying it from someone you do really know the history of it. it may have a crank bearing ready to go, or a water pump that was never rebuilt and ready to go, again i could go on and on. but by rebuilding the 580 he knows what he has.
i saw his posting as asking what the best direction to go in his situation was, not how to install the 680.
i do believe you and a few other guys here have very good reputations as knowing what your doing, and i respect that. but i thought myself and the other posting 1-12 were helpful to his situation, and we all only did what anyone could do in a internet forum, offer our opinion and see what others have to say.