Well, perhaps this one might qualify. While taking the excellent advice re exhaust donuts, I came across a linkage on the starboard side originating from the right side of the carb, into a vacuum slave of some kind, hard linked to a valve at the point of connection to the exhaust pipe, where the donut appears to be shot. Operating this valve by hand seemed to quiet the leak a little. I have no idea what this is so any help would be appreciated.

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Dan & Suzy Z
'81 Euro 28

Heat riser?