This is the complete 11L Rotary Carb used on the following engines: .18TZ(S) .18TZ-TX .18TZ FEATURES: Genuine O.S. replacement parts INCLUDES: One complete 11L carb One rubber carb gasket OSMG6220 REQUIRES: Installing on engine SPECS: Length: 1.2" (31mm) approx. including needle and idle stop screw Width: 1.8" (46mm) approx. including needle and throttle arm nut Height: 1.6" (40mm) approx. including needle Diameter: 0.64" (16.3mm) OD of intake (throat) 0.45" (11.5mm) ID of intake @ widest point (top) 0.28" (7.04mm) ID of intake @ narrowest point (bottom) 0.51" (12.96mm) OD of neck including thermo insulator (the part that inserts into the crankcase) 0.28" (7.05mm) ID of neck @ narrowest point (top) 0.33" (8.58mm) ID of neck @ widest point (bottom) COMMENTS: Carb can be identified with an "11L" on the back side of carb body tjt 032905 ir/jxs updt jxs 5/24/05