There are tons of carbs available for this series of saws. The Walbro fully adjustable carbs are fine. The Zama carbs occsionally have seat leakage issues when high concentrations of ethanol are present in the fuel. Personally, I prefer the Tillotson HU-131A carb for these saws. Its cheap- about $32.00 and very dependable. It is my go-to carb for the 1123 series saws when a carb is uneconomical or impossible to rebuild.