| Diagram | Fig. 8 — CARBURETOR TR7RV · ref 4 |
| Subsystem | fuel |
| Listed in parts books | 1968–1970, 1975–1980, 1983 |
Screw, float and mixing chamber tops
Screw for the float chamber and mixing chamber tops on Amal Concentric carburetors, now listed as 622/086.
This is the small screw that holds the float chamber top and the mixing chamber top onto an Amal Concentric carburetor. It shows up across a long run of Triumph carburetor figures in the parts books, from the Mk I and Mk II Concentric setups on TR7RV and T140 models back to the earlier T90, T100S, T100C, T100T, and T100R carburettors, so it is a common item to need whether you are servicing an older Amal or a later Concentric.
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Because it is used on both the float bowl and the top cap of the mixing chamber, most carbs will need more than one of these, and it is worth checking your other screws for stripped slots or a buggered thread before you close things back up.
The factory later superseded this part number to 622/086, so if you are working from a newer parts list or ordering from a current Amal reference, that is the number you will find it under now. Either number gets you the same screw.
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