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Message: <blockquote data-quote="redgaz54" data-source="post: 636221" data-attributes="member: 26177">Im well familiar with tuning  carbs. With these Solex 34's i turn in small screw very slowly till revs just start to fall, then turn back out till it smooths out, the another half a turn, then set idle speed with large screw. That said i usually hook up my CO meter, fine adjust if necessary to 3-4% CO (its usually ok anyway)All said your only setting the idle mixture.BTW i wouldn't set timing on a bus any higher than 30°.Not just my opinion, advised by several vw experienced bods.Good things are better now<img class="smilie smilie--emoji" loading="lazy" alt="👍" title="👍" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f44d.png" /></blockquote>