Carburetor Rebuild Kit for Walbro K20-WYA Aftermarket Carburetor Rebuild Kit for Walbro For some Walbro WYA series carburetors Replace Walbro K20-WYA Use D20-WYA if you need a Gasket and Diaphragm kit Order by 5.00 PM, ship at next day with USPS first class mail.