Long story short, I left the oil drain plug out and lost all of my oil. Next day got a new drain plug and oil. It ran fine to my friends house, about 30 miles away. On the way home, I made it two miles before it started knocking. I turned around as soon as I could to get the bike back home. The bike will crank and run and doesn't seem to have lost any power, but is knocking pretty bad. I dropped the engine already. Not sure if I want to dig into it to see what is wrong or take somewhere. The only other options I see is a used engine or just part that current bike and get another used bike. Does anyone have any suggestions? Anybody know what fits into a 2005 ZX6R frame and where to get a engine from a reputable seller?