| Diagram | Fig. 8 — Chaincases, Chains, Sprockets, Clutch, Alternator · ref 22 |
| Subsystem | primary |
| Listed in parts books | 1975 |
Norton 'O' Ring
A small 'O' ring for the Norton Commando primary chaincase/hydraulic tensioner area, part number 06-2580.
This is an 'O' ring listed under Norton part number 06-2580, showing up in the catalog under the inner and outer chaincase figure and again on the hydraulic tensioner listing for the Commando primary. It's a small sealing ring meant to keep oil where it belongs rather than weeping out around a fitting or cover joint in the primary chaincase area.
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Our record on this one is thin - it only turns up in one catalog entry, tied to the 1975 model year. If you're chasing a leak around the chaincase or the hydraulic tensioner plug on a Commando, this is worth checking against what you've got, but confirm the exact location before you order since the catalog doesn't spell out precisely which joint it seals.
Given how little detail we have to go on, give the shop a call if you want to make sure this is the right ring for your application before it ships.
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