It's hard to say. Your "excessive" may be perfectly normal, or it may well be on the excessive side. Mine sounds like an engine, not a sewing machine, but also not as mechanically clanky as an old 74 iron head Harley Sportster, an 95 Speed Triple or an old 79 Bonneville or as clanky as a 99 Laverda Strike (a few of the bikes I've had in the past that all were noisy to some degree) Mine sounds no different today than it did when I bought it new, and its at 24,000+ miles, uses no oil, runs like a top, no metal (or other) particles in the oil filters or magnetic plug, certainly not a concern to me......But you might want to search the German MZ 1000S forum and see if there is anything about it over there perhaps.