Well, the guy at the counter and probably whomever he's talking to on the phone up the chain doesn't recognize the legaleze they're looking at. Note specifically, first, the title of the document. That immediately limits the scope of everything you'll be reading. Nothing they'll be talking about deals with anything other than their obligation to maintain engine emission compliance. Note the continual appearance of the phrase (all or in part) "small non-road engine" in the document. That's pertinent to the Clean Air Act. You'll find everything (and more) than you want/need under the "Small Spark-Ignition Engines (lawn mowers, leaf blowers, chainsaws, etc.)" link at the EPA's <a href="http://www.epa.gov/otaq/nonroad.htm">Nonroad Engines, Equipment, and Vehicles</a> web page.
I don't know specifically why they need to provide the two-year transferable warranty and Stihl evidently does not. I understand that older, (now) non-compliant models can remain in the lineup for a time so long as there is enough "clean" representation throughout the family. Eventually, though, the venerable 55 will be gone, gone, gone; as well certain others. Maybe Stihl doesn't have to provide the extended (transferable!) warranty on emission-related components because the bulk of the equipment is not imported, and maybe even that (if so) is a temporary situation for them.
It's fairly obvious that Stihl offers a warranty on the whole unit with differing lengths dependent upon use. Perhaps this is more marketeering by Husky (and Dolmar?) by making their 2-year (emissions) warranty appear to be (or maybe their staff honestly "mistakes" it so) covering the entire device when in actuality it does not. Again, the specific parts covered by that warranty are enumerated. That document does not cover any parts not listed in it.
I guess that's most of why I want to determine what the actual <i>chainsaw</i> warranty is as opposed to the engine component of it.
Glen