Metering needle
Jaguar: E-Type Series 1, Series 1.5 and Series 2 European models (1961-70) plus Series 1 and early Series 1.5 USA and Canada models to September 1967 - OTS to chassis no. 1E15979, FHC to 1E34582 and 2+2 to 1E77708 • XK150S with triple SU-HD8 carburettors (1957-61) • Mk10 3.8 and 4.2 (1961-66) • 420G (1966-70) • 420 and Daimler Sovereign (1966-69) • XJ6 Series I to March 1971 - 4.2 with A/C to engine no. 7L29581, 4.2 without A/C to engine no. 7L26479, 2.8 to engine no. 7G16692
fixed type - marked: UM
Fixed metering needles have to be dead centre in the hole of the jet so take some time to fiddle around with them to get this right. If it is not correct the fixed needles won't fall completely onto the bridge in throat of the venturi of the carb resulting in poor light throttle running.
Please note: the needle choice will depend on range of engine modifications.