Hey bro,
first before you ever consider even looking at it, ask him for the VIN number, you have to make sure its not STOLEN,
get the VIN call the police dept they will only tell you yay or nay on stolen,
then call the DMV they will tell you if it will be worth the purchase, they cant tell you anything other than, lien on it? no, fees? yes, salvage? yes, they can only answer questions like that, they can not give you more info,
then pm me the VIN and ill run a report if the first to are not blazing flags,
if its a clean bike meaning not stolen or salvage we want to check the mileage to make sure its accurate, people can switch clusters on these things easy, and sell you a 30K bike when the cluster read 6K,
you dont really need a manual, that isnt going to tell you much, you need to find a friend who knows bikes or tell the guy you want to take it to a mechanic to have it looked it,
the accident could have been cosmetic or it could have been major meaning the frame tweaked and he bought a repsol kit to blind the noobs,
tell him to send you the VIN and pictures of the damage, any dents on the frame beware, any rash on the frame beware but rash can be just rash,
as him what he had to replace what happened in the accident was it a lowside or a highside, lowside just fell ans skidded, high side the bike flipped most likely,
good luck, and hopefully its a nice bike,