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Carb idle mixture
http://www.international2cvfriends.com/forum/viewtopic.php?f=7&t=3534		 Page 1 of 1
Author:  single spoke [ December 10th, 2011, 9:59 pm ]
Post subject:  Carb idle mixture
Hi, I'm sure this will have been discussed before, but been searching and can't find it.
To adjust my carb idle mixture, the way I understand to do it is to have engine warmed up, then screw IN the idle mixture screw until engine begins to hunt/stall, then screw OUT 1/2 turn. Adjust idle speed afterwards on throttle stop screw.

Can anyone confirm I've got this right?

Also, I'm thinking the setting of this wont have much effect on fuel consumption?

Currently the cars starting in the cold weather with the choke fully off, and tends to die when I pull it out.

Thanks in anticipation, new around here
Author:  ken [ December 10th, 2011, 10:33 pm ]
Post subject:  Re: Carb idle mixture
single spoke,
the procedure you've described is correct, but it might be worth checking whether the 'choke pull-off' device is kaput, if one is fitted to your carburettor.
It's held onto the carb lid with a pair of phillips head screws and has a tendency to either fall off or become a useless ornament when its diaphragm has failed.
Test it by trying to pull the wire clip forwards when the engine is running, if there's no resistance, it needs binning.

Image
Limiting travel of choke flap. by slcchassis, on Flickr

Image
This is as far as it goes... by slcchassis, on Flickr

Usually worthwhile to adjust the closing position of the secondary butterfly before adjusting the idle mixture.
Clip the top off the anti-tamper cap and turn the screw 1/2 to 1 turn anti-clockwise.

Image
screw for adjusting secondary butterfly by slcchassis, on Flickr

Adjusting the idle mixture shouldn't make that much difference to your fuel consumption, unless you spend a disproportionate amount of time sitting in traffic jams with the engine idling or you drive everywhere on less than 1/8th throttle... ;)

ken
Author:  single spoke [ December 10th, 2011, 10:46 pm ]
Post subject:  Re: Carb idle mixture
Thanks Ken,

So don't bother replacing the 'choke pull off', just bin it and fill the holes with screws?

Adjust 2nd butterfly to be closed?

Pictures really helpful, thank you
Author:  ken [ December 10th, 2011, 11:00 pm ]
Post subject:  Re: Carb idle mixture
Yes, or use one of these for a neater job...
http://www.ecas2cvparts.co.uk/choke-pul ... -1755.html

It's also advisable to make that alteration to the little stop on the offside of the carb, otherwise it's very easy to flood the engine when the choke is activated.

ken

single spoke wrote:
Thanks Ken,

So don't bother replacing the 'choke pull off', just bin it and fill the holes with screws?

Adjust 2nd butterfly to be closed?

Pictures really helpful, thank you
Author:  pavlos_k [ December 13th, 2011, 9:01 am ]
Post subject:  Re: Carb idle mixture
Guys here i am again.

I was wondering something about the screw that looks on the first photo down right . The problem is that this screw doesnt have anything inside like a spring or something . So if i unscrew it even 1/4 of a circle then it keeps unscrewing while the engine is running and final it will fall of.

So what do i missing here?
Author:  Sean [ December 13th, 2011, 9:28 am ]
Post subject:  Re: Carb idle mixture
pavlos_k wrote:
Guys here i am again.

I was wondering something about the screw that looks on the first photo down right . The problem is that this screw doesnt have anything inside like a spring or something . So if i unscrew it even 1/4 of a circle then it keeps unscrewing while the engine is running and final it will fall of.

So what do i missing here?


Pavlos,
in kens first pic, at the top of the page, the "jet" with the hexagonal head at the right just below the petrol pipe is the idle jet. This should be screwed in tight as they have a tendancy to fall out and when they do the engine wont idle. There is no adjustment to be made here the only maintenance is to make sure the small drillings are clear. The hole from the outside (hex bit) should be blocked.

The "mixture", "Co2" jet that you set the idle for test is the small round one slightly left of the hex head idle jet. its all mucky in kens photo, it sticks up at an odd angle , usually it is in a steel cup or shield with a spring under the head. The head has a screwdriver slot that is off to one side.

Sean

To set the engine properly you screw it in till the engine starts to sound un happy then take it back out by 1/2 a turn
Author:  pavlos_k [ December 13th, 2011, 10:08 am ]
Post subject:  Re: Carb idle mixture
Sean i am start to thinking you as my 2CV angel ....!

Thanks a lot .
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