RE: Homelite 30CC carb
The homelite 30 likes the 11 mm carburetor for maximum power. Anything bigger has poor throttle response. The best Walbro's have a "28" in the Venturi. "24" carbs run much better than stock "20" .
The stock original carb for a Homelite 30 string trimmer is a 5/16" carb. The Walbro's have a "20" in the venturi on the stock carb