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Non-Genuine Walbro Rebuild Kit for all Walbro WB Carburettors Vittorazi Moster & Atom Series 2 (non-WG8 Carb) Work as well as the original at a fraction of the cost.
If you replace the membranes, you should also replace the Metering Spring and check the Needle Height and pop-off pressure, which are critical to the carb's performance.