| Also known as | T4010 |
| Diagram | Fig. 12 — INNER AND OUTER CHAINCASE · ref 1 |
| Subsystem | primary |
| Listed in parts books | 1970–1971 |
Inner primary chaincase
Inner primary chaincase, the fixed half of the primary cover that houses the chain and clutch in oil.
The 57-4010 is the inner primary chaincase, the fixed half of the primary cover that bolts to the frame and forms the back wall of the primary chaincase enclosure. It sits between the engine and gearbox sprockets and the outer cover, keeping the primary chain and clutch running in an oil bath and out of the weather.
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This is the older book number for the part, also listed as T4010 in the earlier catalog format. It shows up in the parts books under the INNER AND OUTER CHAINCASE figure, which covers both halves of the primary case assembly.
Our catalog record on this one is thin, just the two listings spanning 1970 to 1971. If you're matching this up to a specific bike, give us a call and we'll confirm fitment before you order.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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