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Non-Genuine Walbro Rebuild Kit for all Walbro WB Carburettors Vittorazi Moster & Atom Series 2 (non-WG8 Carb) We offer this series due to the cost of the original set, they work well 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 and tuning thereafter.
Factory R, be mindful that there is a different sequence of order of membranes, refer to attached photos and engine manual.