Hi all
I took my cooper s for a good 4 hour run today and it is running rich which I thought it was, so I want to put a new kit through the carbies and get the mixture right. I have been told I have 1 1/2 su carbs but I want to be sure before ordering the kit how can I tel what sort and size carbs i have and what sort of kits should I get, just gaskets and main jet or a complete rebuild kit and if so where from
Cheers
Glenn

You can tell from the bolt pattern where they bolt onto the manifold (at least for HS type carbs, I'm not sure about the HIF series).

Two bolts on each one in a vertical configuration = 1 1/4"
Two bolts on each one in a diagonal configuration = 1 1/2"
Four bolts in a square configuration = 1 3/4"

Check out this link in the how to's for the gaskets which should clear up what I said above.: http://www.ausmini.com/forums/viewtopic.php?f=25&t=82577.

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"In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina

Another method is to measure the diameter of the carby inlet.
All spares are available from Fabre Australia in Sydney, just phone them and they will help. If needed you can send them a photo of the carb and they can identify it for you.

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

HS2 (1 1/4) then HS4 (1 1/2) then HS6 (1 3/4)

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Measure the outlet, not the inlet. For example a 1-1/2" HS4 is only 35mm inlet (not 38.1= 1.5") but the outlet is 1.5".

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

SU carbs are actually quite easy to tune once you know how, provided they are in good nick. It might be worth taking it somewhere that knows minis and asking them to give it a tune - you'll just pay for the labour, so it won't be expensive.

They could also tell you if they need rebuilding. It won't hurt to get a rebuild kit of course, but it may be just fine as it is, and just needs a tune.

Thanks everyone for your help, they haven't been touch for 25 years so might be best to do a rebuild kit I think

If you have wear in the spindles, it'd be worth getting the complete rebuild kit and getting them rebushed. I got the full rebuild kit for mine from SU Midel (aka Fabre).

http://www.sumidel.com/index.html

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Thanks Timmy will look into it

I have H4s (1-1/2", vertical stud pattern) on a 12A309 manifold

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....you just lost him his insurance bonus!

997

Thanks again everyone for your help, I'm pulling carbs out and doing a rebuild and I want to clean the carbs up, what is best way to make them nice and clean ?

I've seen some good info on here about parts cleaning, soaking the parts in degreaser diluted with water even a vinegar solution I think. One bloke even used the dish washer! If you use the search feature and use those words "parts, cleaning, carbys" loads of reading will come up.

I've heard lemon juice works well for soaking carbs but I've not tried it.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Boiling them in lemon juice works too apparently .

I used a dishwasher.
Gets them really clean but turns them almost black.
I would get them Soda blasted next time.

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Find a job you love and you will never have to go to work !