Looked at the picture of an Echo CS 510 EVL crankcase assembly for a chainsaw and the crankshaft saddle is not in the head like the BME. It is separate. The head looks a bit different too. I found a real picture of a crank assembly for the CS 510 and I will pull out the BME crank and compare them. I know one side of crank is cut off outside of rear bearing. Just trying to save some money here! Paul