| Diagram | Fig. 8 — CARBURETOR TR7RV · ref 8 |
| Subsystem | fuel |
| Listed in parts books | 1969–1970, 1976–1978, 1980, 1985 |
Needle (622/124)
Amal Concentric carburetor jet needle, catalog number 99-1036, needle code 622/124.
This is the jet needle for an Amal Concentric carburetor, catalog number 99-1036, listed under the needle code 622/124. The needle rides in the carb's needle jet and works with the throttle slide to meter fuel across the mid-range of the throttle opening. As the slide rises and falls the taper on this needle changes how much fuel gets past the jet, so it's one of the parts that decides how the bike pulls off idle and through the midrange.
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Our catalog shows this needle appearing across a range of Amal Concentric carburetor listings, including fitments noted for the T90, T100S, T100C, T100T, T100R, T140V, and TR7RV machines, spanning entries from 1969 into the mid-1980s. Because Amal used different needle profiles for different carb bodies and jet combinations, the 622/124 code is the detail to match against what's stamped or listed for your own carburetor rather than going by model name alone.
If you're rebuilding a Concentric and pulling the old needle to compare, check the number against this one before ordering. Needles look similar side by side but the taper differences matter for how the carb runs, so get the code right rather than eyeballing it.
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