| Diagram | Fig. 2 — CARBURETOR AND AIR CLEANER · ref 10 |
| Subsystem | fuel |
| Listed in parts books | 1968–1974 |
| Also fits (as replacement) | 1968–1970, 1975–1980, 1983, 1985 · for 99-0516 |
Throttle stop screw (99-0516)
Amal carburetor throttle stop screw that sets idle slide position, PN 622/077 (formerly 99-0516).
This is the throttle stop screw for Amal carburetors, part number 622/077, the older 99-0516 in factory terms if that's what your parts book shows. It's the small screw that sets where the throttle slide rests at idle, threading into the carb body and butting against the slide so the engine has a baseline opening to run on when you let off the twistgrip.
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It shows up across a wide run of Amal-carbed catalog entries, from the smaller unit twins like the T90 and T100 family up through T120R and T140V listings, so it's a part that gets used across a lot of different Amal Concentric setups rather than being specific to one bike.
It's a cheap thing to have on hand since it's easy to lose track of when you're pulling a carb apart, and getting the idle screw right is part of getting the carb to hold a steady idle at all.
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