This .106 needle jet is specific to the update kit used on Amal MK2 carburetors and is specifically designed for use with the 2A1 needle jet.
The 2928/122B .106 needle jet is part of the Amal MK2 non-EPA update specification, as originally fitted to European-market Triumph T140D and T140E models. Distinguished by the single ring around the top of the jet body.
This specific needle jet must be used in conjunction with the 2A1 needle, as part of the Amal MK2 non-EPA update specification. The entire update kit is designed to allow improved performance on US-market late-model Triumph T140 models fitted with Amal MK2 carburetors.
The carburetor must be partially disassembled to access the needle jet. It is threaded into the jet holder, which requires removal of the float bowl for access.