| Also known as | E9554 |
| Diagram | Fig. 4 — MANIFOLD AND TAPPETS · ref 7 |
| Subsystem | engine top |
| Listed in parts books | 1970–1971, 1974, 1976–1978, 1980 |
Insulating ring > Carburettor to manifold
Rubber insulating ring that seals the carburetor to the intake manifold stub, catalog number 70-9554.
This is the insulating ring that seats between the carburetor and the intake manifold stub, part number 70-9554 (also listed as E9554 in older books). It shows up in the manifold and cylinder head figures across catalog listings running from 1970 to 1980, and it's part of what keeps the Amal Concentric seated correctly on the manifold.
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It's a small rubber piece but it does real work — it takes up the gap between carb and manifold so you get an airtight seal there, which matters for how the engine pulls air and how it idles. After years of carbs coming off and going back on for cleaning or jetting, these rings tend to go flat, crack, or take a permanent cupped set, which is usually when people notice an air leak or a lean-running problem they can't pin down.
If you're pulling the carb for any reason, it's worth a look at this ring while you're in there. It's cheap insurance to keep a spare in the toolbox — worth having one on hand so you're not waiting on a part to finish a carb job.
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