Try to find the number on the Zama that you might can reference ion Google. Or maybe just measure the venturi?

Tell us about the size of the weed whacker and there'll be ten of us telling you what walbro to use.

On the 25 -30 cc whackers the 11.11 mm (28) Walbro is what everyone uses and the most famous of these is the WA-167-1. Another was the WT-499-1

The 25 to 30 engines mostly came with a 5/16" venturi carb. The Zama was more common on these than the Walbro.

A 30 - 33 cc chain saw often has a Zama that is 7/16" venturi that would work great on most weed whackers.

You have to have both a low speed and high speed needle valve.