O-ring for sealing the carburetor enricher cable holder to the carburetor body (MG# 14938300): Dellorto part number 8297.00.30
Moto Guzzi V700, V7 Special, Ambassador, 850 GT, 850 GT California, Eldorado, and 850 California Police models
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On some Dellorto VHB carbs (certainly not all), the aluminum holders for the enricher cables have a groove to accept a small o-ring. The purpose of this O-ring is to prevent foreign material (e.g., rain) from entering the carburetor.
The size of the O-ring (MG# 14938300) used to seal the carburetor enricher jet to the float bowl is 8 mm ID × 1 mm wide. Viton O-rings are best, but Buna-N work just fine and are a lot cheaper. Make sure to purchase an O-ring that is sufficiently soft...something with a Shore Durometer (A Scale) = 70 is great.
McMaster-Carr part number 9262K442 may work well. Thanks to Jon Sefcek for sending me this information in a private communication.
Dan Eberhardt reports that McMaster-Carr part number 9263K548 will work well (1 mm × 8 mm, Viton 75 durometer). Thanks to Dan Eberhardt for sending me this information in a private communication.