B&S 550ex won't rev up

Format your model number as 09P702-0122-H1 for IPL look-up

First here the governed max speeds depending on the color of governor spring. Check with tach, guessing will not cut it. These governor depends on max blade tip speeds. Here small diameter bar blades runs at slower speed to meet safety requirements,

Blue 2600-2700
Purple 2800-3200
Orange 3200-3600
Yellow 3600-4000

This covers the nozzle assembly in the plastic carburetor.
Nozzle assy service bulletin

Of all things don''t over tighten the fuel bowl retaining screws as they can strip easily. Other than that these are very simple carburetors and are very simply to clean.

But as Tyler said I also don't a whole lot experience on these either as the mowers with these are so cheap most users will not even bring them to the shop. Afraid of a large repair bill.

Entire Thread
Subject	Posted By	Posted
B&S 550ex won't rev up	speedy	09/01/19 09:04 AM
Re: B&S 550ex won't rev up	Tyler	09/01/19 09:46 AM
Re: B&S 550ex won't rev up	AVB	09/01/19 12:28 PM
Re: B&S 550ex won't rev up	speedy	09/01/19 08:19 PM
Re: B&S 550ex won't rev up	NormK	09/01/19 09:03 PM
Re: B&S 550ex won't rev up	Mowerfreak	09/01/19 09:19 PM
Re: B&S 550ex won't rev up	NormK	09/01/19 09:36 PM
Re: B&S 550ex won't rev up	Mowerfreak	09/01/19 09:50 PM
Re: B&S 550ex won't rev up	NormK	09/01/19 10:02 PM
Re: B&S 550ex won't rev up	Mowerfreak	09/01/19 11:53 PM
Re: B&S 550ex won't rev up	NormK	10/01/19 01:05 AM
Re: B&S 550ex won't rev up	speedy	10/01/19 08:27 AM
Re: B&S 550ex won't rev up	NormK	10/01/19 09:16 AM
Re: B&S 550ex won't rev up	bigted	10/01/19 01:08 PM
Re: B&S 550ex won't rev up	speedy	14/01/19 07:05 AM
Re: B&S 550ex won't rev up	AVB	14/01/19 04:12 PM
Re: B&S 550ex won't rev up	NormK	14/01/19 10:10 PM
Re: B&S 550ex won't rev up	NormK	15/01/19 04:31 AM
Re: B&S 550ex won't rev up	speedy	15/01/19 07:13 AM
Re: B&S 550ex won't rev up	Tyler	15/01/19 07:54 AM
Re: B&S 550ex won't rev up	NormK	15/01/19 07:39 AM
Re: B&S 550ex won't rev up	NormK	15/01/19 08:40 AM
Re: B&S 550ex won't rev up	AVB	15/01/19 03:24 PM
Re: B&S 550ex won't rev up	speedy	15/01/19 09:07 PM
Re: B&S 550ex won't rev up	NormK	15/01/19 09:55 PM
Re: B&S 550ex won't rev up	AVB	15/01/19 11:40 PM
Re: B&S 550ex won't rev up	Mowerfreak	16/01/19 02:54 AM
Re: B&S 550ex won't rev up	speedy	16/01/19 06:56 AM
Re: B&S 550ex won't rev up	speedy	18/01/19 08:07 AM
Re: B&S 550ex won't rev up	NormK	18/01/19 08:40 AM
Re: B&S 550ex won't rev up	speedy	18/01/19 08:07 PM
Re: B&S 550ex won't rev up	speedy	22/01/19 07:05 AM
Re: B&S 550ex won't rev up	NormK	22/01/19 07:26 AM
Re: B&S 550ex won't rev up	NormK	25/01/19 10:31 PM
Re: B&S 550ex won't rev up	speedy	27/01/19 08:02 AM
Re: B&S 550ex won't rev up	AVB	27/01/19 03:34 PM
Re: B&S 550ex won't rev up	Mowerfreak	27/01/19 10:08 AM
Re: B&S 550ex won't rev up	NormK	27/01/19 09:20 PM
Re: B&S 550ex won't rev up	thecarbymaster	31/01/19 12:09 PM
Re: B&S 550ex won't rev up	Tyler	02/02/19 10:14 AM
Re: B&S 550ex won't rev up	speedy	02/02/19 08:24 PM
Re: B&S 550ex won't rev up	NormK	02/02/19 10:27 PM
Re: B&S 550ex won't rev up	speedy	04/02/19 10:12 AM
Re: B&S 550ex won't rev up	NormK	04/02/19 10:38 AM
Re: B&S 550ex won't rev up	Tyler	04/02/19 01:14 PM
Re: B&S 550ex won't rev up	speedy	06/02/19 02:21 AM
Re: B&S 550ex won't rev up	speedy	06/02/19 03:29 AM
Re: B&S 550ex won't rev up	NormK	06/02/19 03:49 AM
Re: B&S 550ex won't rev up	AVB	06/02/19 03:26 PM
Re: B&S 550ex won't rev up	speedy	10/02/19 08:45 PM
Re: B&S 550ex won't rev up	AVB	10/02/19 09:43 PM
Re: B&S 550ex won't rev up	NormK	10/02/19 09:57 PM
Re: B&S 550ex won't rev up	NormK	13/02/19 07:49 PM
Re: B&S 550ex won't rev up	speedy	22/02/19 01:40 AM
Re: B&S 550ex won't rev up	NormK	22/02/19 07:34 AM
Re: B&S 550ex won't rev up	speedy	22/02/19 09:36 AM
Re: B&S 550ex won't rev up	speedy	20/06/20 10:35 PM
Re: B&S 550ex won't rev up	Mowerfreak	21/06/20 02:29 AM