Walbro parts and service manual #305, carburetor applications...
EVERY Zenoah airplane engine has a Walbro MADE for that engine...
Listed as "scale model" in the list...
Manufacturers have to pay Walbro to develop a carb...The ones that don't just try some different carbs until they find one that works....
DA used WA201 carb..Original application, Fox Motori...The high needle passes just enough for most applications....The WT76 has slightly larger passages and works better...The 201 can be enlarged to work, maybe they do now, they didn't at first...