ORIGINAL: proptop
I ran out of adjustability w/ mine and took off those little blue limiting collars. And I ground down the roll pin on the high speed needle. Just out of curiosity, what type of plug did yours come with? Mine had what looks like a 4 stroke plug, I believe called a (Hangar 9) "Super Plug". I replaced it w/ an O.S. type F 4 stroke plug, and my problem went away (and mine's inverted). You being in Tx. though, maybe you wouldn't want so hot a plug?
Yep, mine came with a "Super Plug" as well. They advertise it to be used in engines with Transitioning Problems. [X(] Hmmm....
I'll try a few other plugs I have laying around. Also that 4 stroke plug (thunderbolt for me) shouldent be too warm in the current winter weather[8D]
Also, I will definitly try adding a MousseCan Muffler to see if that helps.