| Diagram | Fig. 8 — CARBURETOR TR7RV · ref 10 |
| Subsystem | fuel |
| Listed in parts books | 1969, 1975–1978, 1980 |
622/129 Air valve spring
Amal Concentric carburetor air valve spring, part number 622/129, used across a range of Triumph twin models with Concentric carbs.
This is an air valve spring used inside Amal Concentric carburetors, catalogued under the Amal part number 622/129. It shows up in the parts books across a range of Triumph carburetor listings, from the TR7RV and T140V setups down to the smaller T90, T100S, T100C, T100T, and T100R Concentric carbs, so it's a common wear item across a lot of the Concentric-equipped lineup rather than something specific to one model.
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The air valve spring lives behind the slide/air valve assembly and works to return the air valve to its seated position once you're off the throttle. If a bike is idling erratically, hanging up at part throttle, or the slide isn't snapping back the way it should, a tired or broken spring in this location is worth checking.
Our catalog record lists this part under the same number, 622/129, on both ends of a supersession note, so what you're getting today is the current form of this spring regardless of which year's parts book you're working from. Confirm which carburetor you've got before ordering, since several different Concentric variants used this same spring.
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