My 2003 400ex is knocking pretty bad in the bottom end. It always had a tick sound from the exhaust but now there's a loud knock from the jug near the crank. What else could cause a engine knock thats pretty loud down there? Checked the oil after I heard it, dipstick was completely covered in the oil. I was gonna put new oil in it tomorrow but I dont wanna waste new oil. Just got broke in last month but the person who rebuilt it didn't replace the crankshaft but everything else is new that was bad.