Don't buy them for a bigger engine, they fit most regular carburettors like pz30, but the internal inlet is too small. After installation, the engine fell flat after 4,000 revolutions, it did not have enough air. Got it, works great. Might be ok for a 110 or less engine, but no more. The build quality is good but the construction of the boot is terrible making it unusable. The picture I've attached shows how narrow the inside of the boot is.
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