| Also known as | 71-3573A, E11459 |
| Diagram | Fig. 4 — INLET MANIFOLD · ref 4 |
| Subsystem | engine top |
| Listed in parts books | 1974 |
Joint washer, insulating block
Insulating block joint washer for the inlet manifold, 1974, superseded by 71-3573A.
This is a joint washer for the inlet manifold area, listed in the parts book under the insulating block heading. It's a sealing gasket that sits in the intake tract where the manifold meets the head, and it's the kind of small paper or fibre part that's easy to overlook until the bike starts sucking air past a bad seal.
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The catalog shows this one appearing for the 1974 model year, and it was later superseded by 71-3573A, which is the number you'll find it under in newer supply chains. It also shows up as E11459 in some listings, so if you're cross-checking against an older parts book that's the number to look for.
If you're chasing an air leak or a rough idle around the intake, this is a cheap and simple thing to replace while you've got the manifold off. Confirm which side and which manifold configuration you're working with before ordering, since the catalog record here is brief.
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