If it the above plastic carburetor and I think the 550EX is the 09P series engine the following service bulletin might need applying depending on the date code.

Carburetor Module Upgrade

Entire Thread
Subject	Posted By	Posted
Victa corvette (Briggs) surging	Ollie81	05/06/19 03:01 AM
Re: Victa corvette (Briggs) surging	wce	05/06/19 04:22 AM
Re: Victa corvette (Briggs) surging	Ollie81	05/06/19 07:20 AM
Re: Victa corvette (Briggs) surging	wce	05/06/19 10:50 AM
Re: Victa corvette (Briggs) surging	wce	05/06/19 01:00 PM
Re: Victa corvette (Briggs) surging	Tyler	05/06/19 02:47 PM
Re: Victa corvette (Briggs) surging	bigted	05/06/19 03:18 PM
Re: Victa corvette (Briggs) surging	Ollie81	06/06/19 07:07 AM
Re: Victa corvette (Briggs) surging	Mowerfreak	06/06/19 07:09 AM
Re: Victa corvette (Briggs) surging	maxwestern	06/06/19 08:35 AM
Re: Victa corvette (Briggs) surging	wce	06/06/19 01:11 PM
Re: Victa corvette (Briggs) surging	Ollie81	06/06/19 08:53 PM
Re: Victa corvette (Briggs) surging	thecarbymaster	07/06/19 12:31 AM
Re: Victa corvette (Briggs) surging	AVB	07/06/19 01:10 AM
Re: Victa corvette (Briggs) surging	wce	07/06/19 04:16 AM
Re: Victa corvette (Briggs) surging	maxwestern	07/06/19 09:39 AM
Re: Victa corvette (Briggs) surging	AVB	07/06/19 10:29 AM
Re: Victa corvette (Briggs) surging	Ollie81	07/06/19 01:44 PM

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