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I'm in the process of rebuilding a WDO 643SA and having a heck of a time trying to locate the little brass strainers that go in the carb. One of them was still there (30-14, Bowl cover strainer), and I was able to find 30-23 on eBay. The other two (30-34, pump strainer and 30-61, switch strainer) have completely eluded me. I've called our usual vendors, as well as some vintage carburetor businesses/rebuilder, and none have them.

Do the strainers appreciably change anything about the performance of the carburetor? I guess they're only there to prevent particles of a certain size from entering certain circuits in the carburetor, but I wasn't sure there was more to it than that. If they do affect the performance, does anyone out there have a source for these little strainers? Thanks!

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