That's the vacuum sensor. the vac sensor diaphragm has a brass plunger that pushes on a steel ball. I think it allows fuel to flow to the AP when the engine is running, but stops the flow when the engine stops. it's kind of a rube goldberg epa type of thing
On some models the device was disabled at the factory, as on the 81 650. mine didn't have the cover & the orifices on the flange aren't factory drilled or anything. kinda puzzling at first, especially since I didn't know anything about carburetors at the time. the rebuild kit had this triangular thing that wouldn't fit. doh.
Last edit: 09 Mar 2016 07:27 by martin_csr.
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