I own a 2015 Fatboy. I made the huge mistake of running the bike too long without moving. When I heard the first knock, I ran outside and noticed the knock in the engine and white smoke coming from the engine. I turned the bike off immediately. I am not a bike mechanic but I do know my way around an engine. What was the knocking? Does the engine need to be rebuilt? Did it just overheat? There are no visible leaks but I am still worried. As I type this, the bike has been cooling down for an hour. I have not had the guts to turn the bike back on. Once I do, I will record the sound for more advice. Any suggestions/comments?