| Diagram | Fig. 30 — CARBURETOR, T100C · ref 13 |
| Subsystem | fuel |
| Listed in parts books | 1970–1974 |
Needle jet (99-1035) size .106
Amal Concentric needle jet, size .106, part 622/122 (cross-ref 99-1035), used across a range of Amal carburetor setups.
This is the Amal Concentric needle jet, part number 622/122, listed at size .106. The needle jet sits inside the carburetor body and works with the throttle needle to meter fuel through the mid-range of the throttle opening, so it has a direct hand in how the bike pulls off idle and into the mid-throttle range. It's cross-referenced in our books to 99-1035, and it turns up across a wide run of Amal carb figures for T100C, T100R, T120R, TR6R, TR6C, T140V, and TR7RV setups.
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Because needle jets wear where the needle rides against them, a worn one shows up as flat spots, hesitation, or a rich/lean feel that doesn't track with the jet needle or main jet you'd normally chase first. If your bike's been running odd through the middle of the throttle and the rest of the carb has already been gone over, this is a part worth checking.
We don't have exact fitment tied to a specific model year here, just the range of Amal carburetor figures it shows up in across our catalog entries from 1970 into 1974. Bring in your carb or check your book against the .106 size before ordering to be sure it's the right one for your setup.
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