| Diagram | Fig. 8 — CARBURETOR TR7RV · ref 11 |
| Subsystem | fuel |
| Listed in parts books | 1976–1978, 1980 |
Air valve guide sleeve (728/103)
Amal Mk I Concentric carburetor air valve guide sleeve, catalog ref 728/103.
This is the air valve guide sleeve, listed under 99-1037, and it's an Amal Concentric carburetor internal component. It shows up in the parts book under the reference 728/103, which is the Amal-side part number for the same piece.
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The guide sleeve fits inside the carb body and locates the air slide (throttle slide) so it moves up and down cleanly without binding or slop. It's a small item but it matters for how crisp the throttle response feels, since a worn or sloppy guide lets the slide rock in the bore and upsets the carb's metering.
Our catalog record ties this into Amal Mk I Concentric carburetor listings for the TR7RV and T140V. If you're rebuilding a Mk I Concentric off one of these bikes, this is a part worth checking while everything's apart, since it's not something you'd normally inspect unless you've already got the slide out.
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