Hey Dan,
Long ago (1970s) when I was just beginning to learn some wrenching stuff, a Carolina backyard mechanic told me that “Carburetor” was a French word meaning “Leave It Alone”.  As much as the technology has changed, often it seems that approach is still valid.

From: Dan N
Sent: Friday, July 5, 2019 10:54 AM
To: vanagon@GERRY.VANAGON.COM
Subject: adjusting mixture ratio

hi all,

is there a way to adjust fuel/air mixture ratio on a stock 2.1 WBX?