| Also known as | CO11, F8090 |
| Diagram | Fig. 16 — SWINGING FORK AND SUSPENSION UNITS · ref 10 |
| Subsystem | suspension rear |
| Listed in parts books | 1968–1974 |
O-RING SWING ARM BOBBIN
O-ring that seals the swing arm bobbin against the swingarm bushing to keep pivot grease in and dirt out.
This is the O-ring that seats around the swing arm bobbin in the rear suspension. It shows up in the parts book under the swinging fork and suspension units section, and it works alongside the bobbin and the swing arm bushing to keep the grease inside the swingarm cross tube where it belongs and keep dirt and water out.
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It's a small, inexpensive part, but it's an easy one to overlook when you're servicing the swing arm pivot. If you're pulling the bobbins apart to regrease the bushings, plan on fitting fresh O-rings while you're in there rather than reusing the old ones, since they harden with age and stop sealing.
You'll also see this part cross-referenced under the older CO11 form and as F8090 in some listings — same physical part, just different catalog numbering from different eras.
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