| Diagram | Fig. 2 — CARBURETOR AND AIR CLEANER · ref 11 |
| Subsystem | fuel |
| Listed in parts books | 1968–1974 |
| Also fits (as replacement) | 1968–1970, 1975–1980, 1983, 1985 · for 99-0515 |
Air adjusting screw (99-0515)
The tapered air adjusting screw for Amal Concentric carburetors, sets idle mixture; also known by the older number 99-0515.
622/076 is the air adjusting screw for Amal Concentric carburetors, carried in our records under the older number 99-0515. It's the small tapered screw that sets the idle mixture on the carb, and it shows up across a long run of Amal Concentric carburetor figures in our catalog, including listings for Triumph twin models like the T100 and T120/TR6 family as well as later T140V and TR7RV carburetor setups.
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This is a wear item most people replace when they're rebuilding or cleaning up a Concentric carb, since the tapered tip can get grooved or worn from years of adjustment. If your bike is running rough at idle or won't hold a steady mixture setting, this screw is one of the first things worth checking.
Because it appears in so many carburetor figures across different Triumph models and years, fitment is broad, but always double check the screw against your actual carb body before ordering, especially if you're not sure which Concentric variant you have.
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