[Paulporsche]

The mixture richening may be enough to take care of it. If not, you may not need to buy a new WUR. Very often, all that is needed is a procedure called "knocking the plug" which is very simply done. This lowers the cold control pressure and richens the mixture for starting and warmup. You can search this site. There is a ton of info on how to do it.

If the mixture @ start is just slightly lean, a very short knock might be all that you need. If you want to be sure, this can be done while you have a fuel pressure gauge attached so you know exactly where you are relative to spec.

As before, any experienced Pcar mech should know how to do this, and have the pressure gauge, if you are uncomfortable doing it yourself.

Just to let you know, I've been adjusting my own CIS cars for 30 years. Only recently did I borrow a gauge from a fellow Pelican and used it to track down a cold start problem. In my case the WUR needed cleaning and resetting to a spec different from the factory; about 1 bar lower both cold and warm, to make up for engine mods and wear (I think). I have a thread on this. I had someone do the repair and recalibrating to the WUR for $175. If you PM me I'll tell you who did it. I don't think you will have to spend as much time on it as I had to.