new engine

I'm not sure whats going on i put a brand new engine and carb and it still doesn't go the new engine doesn't even start i don't know what i'm doing wrong is there a way to install a new engine ? i put oil , it has gas , new spark plug and it makes a bit of a squeak noise. anyone has any advice ...

Hi, I'm new to mini bikes, I have a completely stock doodlebug. Bottom line is I want to go faster, I want to put a new engine in it, I am wondering what engine I should get (I want it to go at least 40mph with a 180lb rider). If anybody could link me to what engine to get and what ever other...