Brian- a 'true' 5.5kw generator should have no trouble huffin' over a 'true' 2hp air compressor... 5.5kw @ 120v should be 45A or so. A 'true' 2hp single-phase motor should draw about 30A, mebbie surge to 40A starting. My Onan CCK is 'rated' at 5kw, but I've loaded it to almost twice that before the thing even hinted at being loaded... I've started my rotary phase converter from it!
They sure don't build 'em like they used to. (it's better part of 450lbs!)
Tim- I recently rebuilt the K241 in my 109, and when I reinstalled it, I stuck a temporary muffler on it, and (since I didn't have any) ordered some replacements for 109, Loader-Mutt, and my dad's 127. Of course, I changed it, and stuck a new S/G on it and darnit if the 109 didn't start after-firing on me... blew the armpit right out'a my sweater. Thought something was seriously wrong, but couldn't adjust it out.
Next day, I changed the muffler on dad's 127... didn't start it, but my dad ran it a few days later, and it started after-firing. Exact same thing happened on Loader-Mutt.
Well, I think the muffler's internal structure may at least contribute to the situation a bit. I know that the mufflers I got were aftermarket (not IH or Kohler-labeled), and they feel a little lighter... perhaps they don't cool the same way, or develop a 'hot spot' in some location. In the meantime, it's scarin' the pants right off Nick, so I'm gonna hafta find some way to resolve it before takin' him plowin'.