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Mixture starting setting for rebuilt SU H4s

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Mixture starting setting for rebuilt SU H4s #1 This topic is about my 1960 MG MGA
doble Wes Jobe Carstairs, AB, Canada Sign in to contact 1959 MG MGA 1500 Coupe 1959 MG MGA 1500 Coupe 1960 MG MGA	Topic Creator (OP) Apr 16, 2024 03:03 PM Top Contributor Joined 7 years ago 597 Posts

I rebuilt my SU H4s for my 1622 engine. I am looking for a starting setting for the mixture nut. How many flats down should I start out with?
Any thoughts?
Just trying to avoid an initial setting that is too much or too lean to start out.
Just want a good starting point.
Thanks, Wes

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Re: Mixture starting setting for rebuilt SU H4s #2
szpcn0 Bob Shafto New Hudson, MI, USA Sign in to contact 1957 MG MGA 1500 1960 MG MGA 1600	Apr 16, 2024 03:07 PM Top Contributor Joined 5 years ago 2,679 Posts

12 flats should be a good starting point.

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Re: Mixture starting setting for rebuilt SU H4s #3
SteveT3000 Steve Townsend Forest of Dean, Gloucestershire, UK Sign in to contact 1948 MG TC 1957 MG MGA "Mavis" 1967 Austin-Healey 3000 BJ8 2019 Morgan Plus 4 (+4)	Apr 16, 2024 03:18 PM Joined 7 years ago 158 Posts

I will need to check but when I set mine I think the starting point for the depth of the jet tube is 065” below flush with the bridge. From there it was only a flat or two to get optimum hot setting.

Oh and make sure the tube is fully up with the choke off, they can stick a bit.

1957 ‘Oselli’ MGA in Iris Blue
1950cc Stage 2

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Re: Mixture starting setting for rebuilt SU H4s #4
Darvie43 David Hill Narellan, NSW, Australia Sign in to contact	Apr 16, 2024 06:07 PM Joined 9 years ago 764 Posts

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Mixture starting setting for rebuilt SU H4s

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