mechanic

Hi im relatively new here, only like my second post here, long time lurker though. I've finally saved up enough to buy a used 650r. But seeing as this is the first time that i am buying a motorcycle, i was looking to take it to a mechanic or dealership to have a pre-purchase inspection(i know...

Background: I bought a 2007 Ninja 650r and three weeks into riding, the engine blew :(. I was finally able to buy a used engine with 5,000 miles on it. Since I am a student with little money, I was going to install it with the help of a friend who has more knowledge of motorcycles than I do...