Originally Posted by StevieC
The choke should stay on as long as needed for the vehicle to idle correctly. A fall in idle is ok with the choke off, but it shouldn't stumble.
If it does it still needs to be on to some degree or the mixture isn't set right.
Unless it's super cold outside the choke shouldn't need to be on more than a couple minutes before you can start dialing it back or turn it off completely.
My Austin-Mini I had that I would start over the winter, I would start with full choke. Wait a minute then start dialing it back really slowly until the first sign I would feel the engine slightly studder a bit and the just increase it a bit from that point and wait longer and try dialing it back again. Usually the whole process took about 2-3 minutes in approximately 0c (32F) temperatures with just fast cold idle.
It's better for the engine doing this than letting it ride full choke right until it's fully warm as this encourage a much richer mixture and will put a lot of fuel into the oil and wash the cylinders walls of its oil film creating more engine wear as well as contribute to carbon build-up in the engine.
It's better to keep it on the lean side of the choke as much as possible as it's warming up. Listen and feel what the engine says as you start reducing the amount of choke and inch it along from there.
Also in regards to mixture when setting it, warm up the vehicle fully and then turn the mixture screw to lean out the idle jet until there is a reduction in engine rpm slightly (like ~50rpm) and then turn back toward the rich side just slightly from there. This will encourage as lean of a mixture as possible but keep it as close to the proper mixture as possible. Usually about 1/2 turn from the lean stumble point on most carbs. The best way is to set it up using a 5 gas analyzer looking at the emissions like CO at idle but most folks don't have these. (Make sure your spark timing is correct before you do this)
Nah the carb is tuned properly, it ran horribly lean when I got it, so that was the first thing I addressed once I got the car home. I've had other cars and they all had manual chokes, however this Peugeot is new to me because it has a fast idle when you pull the choke, which my previous cars didn't. Also your Mini is real quick with warming up, I clocked mine and it takes about 5 minutes to heat up before it starts working without the choke at about 10c, though it only takes about 1 minute when it's quite warm outside. Also yeah I do the same thing, pull the choke all the way, start the car, then put it to half-way and from there I slowly dial it down as I see the temperature gauge raise