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T24 Carb problem
#1
The AD Chummy has an updraft T24 Carburettor. I have stripped it & cleaned the muck out, checked the jets are the recommended ones & put it back on with a new gasket. The car started well, but will only run with the choke fully out!
It will rev a bit and even tick over like this, but this is not a good long term plan!
No clouds of petrol-ly smoke, sounds quite healthy, but something is clearly wrong somewhere.
Took the carb off again to see if the slow running jet was blocked, but no: clear.
Put it back together, same result.
Mixture screw 1 1/2 turns out from fully in.
What next to try?
Previous owner said it ran earlier this year, but it may have been like this!
David
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#2
Sounds like a blockage in the main jet.
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#3
Could you possibly have air leaks somewhere. It sounds to me like extra air maybe getting in resulting in weak mixture.

John Mason
Running a Seven on a shoe string budget.
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#4
Yes, worth checking manifolds are sealing properly at joint faces.
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#5
Seems unlikely in this case but very stale petrol will often run only with lotsa choke
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#6
Dave, check that the fuel tap isn’t blocked. My Chummy had the same. problem when I got it after it had been laid up for a year or two.
Bryan
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#7
Thanks all
Plenty to look at!
D
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#8
I seem to recall that there is a jet underneath or at the front somewhere on these carbs as well and inside the body - could be wrong but may well be worth checking.
Whatever you do, don't take my word for it!

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#9
Hello David
Do you have a fixed main jet or the adjustable one.
Symptoms sound similar to adjustable jet too lean.
Adrian.
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#10
I agree with Mike, blocked main jet.
Had exactly that problem yesterday with the FZ22 carburetor on my 1929 Saloon. Started easily and ran OK on full choke. No power and wouldn't rev. Stalled as soon as choke closed even slightly. Cleaned jets - all OK.
Jim
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