Metering needle
Product number:
299808
fixed type for Zenith Stromberg carburettors with reference no. 3506 and 3612 - marked: B5CH
Product Information "Metering needle"
Triumph: Spitfire Mk4 USA and Canada models from chassis no. FK1 to FM28000 (1970-74)
fixed type for Zenith Stromberg carburettors with reference no. 3506 and 3612 - marked: B5CH
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.