| Also known as | 622/122B |
| Diagram | Fig. 8 — CARBURETOR TR7RV · ref 15 |
| Subsystem | fuel |
| Listed in parts books | 1969–1970, 1976–1978, 1980, 1983, 1985 |
622/122 Needle jet (.106) 1 Each carburettor
Amal Concentric carburettor needle jet, .106 size, part 622/122, one required per carb.
This is the needle jet for an Amal Concentric carburettor, part number 99-1035, listed in the parts books as 622/122 with a .106 jet size. The needle jet sits down in the carb body and works with the throttle needle to meter fuel through the mid-range of the throttle opening — it's one of the core parts that determines how the carb responds once you're off idle and before you're at full throttle.
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This number turns up across a wide range of Amal Concentric carburettor listings in our catalog, including TR7RV, T140V, and T100-series carb figures, spanning Concentric Mark I and Mark II versions. The factory later revised this part under 622/122B, which is the number you'll see if your parts book or a rebuild kit is more current.
One per carburettor, so if you're rebuilding a twin you'll want two. Worth checking your carb slide and needle together when you replace this, since the needle jet works as a set with those parts to get the fuel curve right.
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