w8ye,
Sounds like you know your Homelites.
A friend got a recent model 25cc that has no low speed needle. He coudn't get his to idle down. He found a small hole drilled in the throttle butterfly and he plugged it. Now it runs fine. Maybe it's not necessary to replace the carb, unless you want one with a bigger throat for more performance.
Waddya think?

I have 2 newer 25cc Homelites that I was planning on using in another twin airplane and they don't have low speed needles. I don't want to buy 2 new carbs if I don't have to.

P.S.
Were you at the Shelby airfair last summer? I flew the Tigermoth and the Cessna Bamboo Bomber twin there. Both are powered by Homelites.

Jim