Just Like A Car Over All Conditon Like They Stated Look For Scrape Marks On The Engin Covers, Foot Pegs, Swing Arm Ex Look At The Bike From The Front And The Back . Make Sure Everything Looks To Be In Corect Alignment. See How The Bike Starst From Cold And How It Idles, Does It Smoke Or Miss At All Check All The Lights Ex Look To See How Much Oil Is In It An What The Color Is , Look For Leeks In The Hoses, Cracks Ex. Fuck Make The Guy Take The Fairings Off Of It So You Can Look It Over Realy Close. Look At The Sprokets To See If They Are Worn . Most Imp Ride The Bike Make Sure It Runs Down The Road, No Draging Brakes Vibrations. Go Threw All Of The Gears And See How They Feal And What Is Sounds Like . If You Can Take It To A Tech If You Know One And Have Them Look At It Or Take The Tech With You . Blip The Throtle And See If It Sticks Or Idles Up Or Down , Stumbleing. Ask If The Bike Has Any Modification. , Just If You Think It Doesnt Look Sound Or Run Right It Probable Is Not Right!