Green’s Dictionary of Slang

carby n.

[abbr.]

(Aus.) a carburettor.

[Aus]‘Nino Culotta’ They’re a Weird Mob (1958) 47: ‘Carburettor, matey,’ said Joe. ‘We’ll start on the carby.’.
[Aus]W. Dick Bunch of Ratbags 219: All our fleet had straight-out exhausts, a few had twin carbys.
A. Mackay Life Pieces II 89: Randy had a double-overhead-camshaft Maserati with four webers. We were always pulling down the carbies to get more out of them [AND].
[Aus]T. Winton That Eye, The Sky 76: Fanbelts. Carbies. Tools.