| Also known as | E8860 |
| Diagram | Fig. 12 — EXHAUST PIPES & SILENCERS · ref 5 |
| Subsystem | exhaust |
| Listed in parts books | 1970–1971, 1973–1974, 1985 |
Spherical washer >Exhaust pipes to cylinder head
Domed exhaust flange washer, PN 70-8860, seats the header pipe nut against the cylinder head to keep the joint sealed.
This is the spherical washer that sits at the exhaust pipe flange where the header meets the cylinder head, part number 70-8860. Its domed shape lets it seat properly against the exhaust flange nut even when the pipe isn't lined up dead straight, which keeps the joint sealed and quiet where a flat washer would just crack or let the joint work loose. It carries the older factory number 70-0410A in earlier catalogs, so if your parts book lists that number, it's the same washer.
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It shows up across a number of exhaust pipe and muffler figures in the catalog, including listings for TR6R, T120R, and TR6C machines with folding footrests, and the catalog spans appearances from 1970 into the mid-1980s. Given how many exhaust figures it turns up in, it's a part worth having a spare of on the shelf since it's a common wear point at the head/pipe joint.
If you're chasing an exhaust leak or a loose header pipe, this washer along with its mating nut is one of the first things to check. Confirm which exhaust clamp arrangement your bike uses before ordering, since the catalog lists it against several different figure setups.
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