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HA;
I always adjust rocker clearances to 0.016" (warm engine), and I use a necked down feeler gauge to assure gauge is not bridging any significant wear-gap in the rocker which would result in the gap being added to gauge and too big an adustment. Like so:

Not like so:

Source: http://www.sw-em.com/service%20notes.htm#Engine
I'm no Weber expert, but I know that changing a jet in a Weber is not too difficult...but you will need the correct new one to install (or a selection from which to choose)...so you need to first get one of those kits which IPD (at least used to loan out), which contained a selection of jets and emulsion tubes.
Good Hunting
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