I am currently working on modifying a ryobi engine (it is actually out of a green machine trimmer, it doesn't have the standard ryobi carb, but everything else is the same) for aircraft use. The carb I have only has an 8mm venturi and only 1 needle valve so I really could use a different one.
according to this thread [link=http://www.rcuniverse.com/forum/m_4886237/anchors_4886237/mpage_1/key_ryobi/anchor/tm.htm#4886237]http://www.rcuniverse.com/forum/m_4886237/anchors_4886237/mpage_1/key_ryobi/anchor/tm.htm#4886237[/link]
I should be looking for a carb with a 26/64" (10mm) diameter.

I did some searching on ebay for all the walbro parts listed with part numbers and only found one around there.
WA-229 = 9.52mm (this is close, but it only has one needle valve, would this work for our needs?)

I did some searching around walbros site to find some that should work, and can be ordered, I didn't find any at 10mm, but I found several at 9.53, there were also a few at 11.11, I thought it best to go smaller and be safe than larger and risk flooding. They are quite pricey.
WT-112 $52.65
WT-142 44.82
WT-364 56.03
WT-654 42.00

I got tired of searching...

So I guess my question is, what model carb are you guys using and where did you get it?

PS.. If I knew then what i know now.. I would have just built a complete modified engine from jagengines.com for $178 plus shipping or from wackerengines.com (call for availability and pricing)