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Austinsevenfriends › Austin Seven Friends Forum › Forum chat... v
SU carburettor

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SU carburettor
David.H Offline
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#1
26-08-2021, 09:51 AM
I have just acquired a new factory rebuilt old stock downdraft SU. Probably been on the shelf for 40 years! Any advice on recommissioning it?
Obviously clean the dust out & oil it & check the needle number, but anything else?
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Ian McGowan Offline
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Location: Shropshire, UK
#2
26-08-2021, 01:15 PM (This post was last modified: 26-08-2021, 01:16 PM by Ian McGowan.)
check that the piston falls freely within the dashpot and that the butterfly opens and closed fully.
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Terrytuned Offline
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Location: Bristol
#3
26-08-2021, 01:45 PM
David the piston spring in a D type SU carb is stronger it should be a yellow spring AUC 1167 they often have the wrong spring fitted. Terry.
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dickie65 Offline
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#4
26-08-2021, 05:09 PM
I took my D2 off as I had a missfire on hard cornering ( usually half way round a roundaboat ) cured with a semi downdraft SU.
This was a fully reconditioned one with the float chamber to the front of the car.
I agree the spring needs to be changed for an Austin 7.
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