The claim is often made that lugging is destructive to engines. I've asked many people about this, including two experienced motorcycle mechanics, but no one thus far has been able to provide any reason to think its true. In fact, both mechanics I spoke with think that lugging does absolutely no harm to an engine. Does anyone here know differently? I'm looking for something a bit more convincing than, "Well, I heard somewhere that...", or "Everyone says it does", or similar remarks. Anyone have a serious explanation they'd care to offer?