| Diagram | Fig. 8 — Chaincases, Chains, Sprockets, Clutch, Alternator · ref 20 |
| Subsystem | primary |
| Listed in parts books | 1975 |
Norton 'O' Ring
O-ring for the primary chaincase inspection plug area on Norton Commando, PN 06-2581.
This is an O-ring used in the primary chaincase area, specifically noted against the inner and outer chaincase and hydraulic tensioner figure. It's a Norton part, and the catalog title we've cross-checked ties it to the Commando's primary cover inspection plug.
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The part number 06-2581 shows up once in our catalog records, tied to the 1975 model year. O-rings like this one do the simple job of sealing a removable plug or cover so oil stays in the chaincase where it belongs.
Given how little detail we have on file beyond the figure placement, call the shop or check your parts book if you want to confirm this is the exact seal you need before ordering.
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