| Diagram | Fig. 9 — CLUTCH AND PRIMARY CHAINCASE · ref 37 |
| Subsystem | primary |
| Listed in parts books | 1969–1970 |
BSA Spider, cush drive
Cush drive spider from the primary chaincase, carries the rubber shock-absorbing segments between clutch and chain drive.
This is the cush drive spider, a part that sits in the primary chaincase between the clutch and the rear chain drive. It's the piece that carries the rubber cush drive segments, which absorb the shock and snatch that comes through the drivetrain every time the throttle opens or closes hard. Without it doing its job smoothly, that shock gets transmitted straight into the gearbox and chain instead of getting cushioned out.
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The catalog shows this part appearing in clutch and primary chaincase listings across 1969 and 1970. The manufacturer tag on this one says BSA, but there's nothing in the description or figure title naming a BSA model, so treat that as unconfirmed and check it against your own parts book or give us a call before ordering.
We don't have much more detail on this one beyond its place in the primary chaincase assembly. If you're pulling the clutch and primary cover apart, this is a good time to inspect the spider and the cush rubbers together for wear.
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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