A new GENUINE AMAL size 100 main jet to suit:
pre war TT series,
10TT9 & 15TT9,
GP & GP2 series,
375, 376 and 389 series monobloc
plus
600, 900 and 1000 series MK1 concentric
and
MK1.5 and MK2 2000, 2600 and 2900
amongst numerous other AMAL carburettors.