Walbro HDA-223 Carb (GP460)

Stock carburetor for GP420 / GP460 engine - Walbro HDA-223. 19mm bore, 15.08mm venturi, 2 jets (independent high and low), and fitting for external case pulse line. PMW part # 121130028. 

Carb settings to begin tuning:
1 1/2 turns out (L)
1 3/4 turns out (H)