so i took my bike out out yesterday for the first time since i let my friend borrow it and i could tell right from the beginning that something was wrong. right after it started up, it just kept pouring out white smoke like crazy. there is a loud ticking noise coming from the cylinder and it reminds me of a valve tick problem i had in my car. its just a really loud click noise that gets louder as you rev the engine.my friend had said that he fell and the bike went down the hill it was still running and on its side so im thinking it could be something majorly wrong since it was still running w/o oil for a little bit. any help is great appreciated!! thanks-Adam