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.