ive found a 06 gsxr 750 motor that is out of a wrecked bike for 600 bucks! i have the opportunity to drive to get it so shipping is not an issue. my question is, what all do i have to look for when i go to look at it later this week? what is more prone to leak/wear out on this particular engine? and also how do i know its a 750 and not a 600?