Originally Posted by Wrenched
The Webers on Lotus Elans I've owned, and come to think of it Dellortos on a Matra had a tendency to poor hot starting. Always OK cold. I think the latter is actually a feature of most fixed-choke carburettors and is generally tied to heat under the bonnet and conducted from the cylinder head.
As with all things - it depends. My Webers suffer form the reverse - in cold weather they seem to suffer from a phenomenon called icing where the intake of air causes too much cooling. Leaving them to warm up under a hot bonnet fixes the problem.
Note that on the Alfa engine the carbs are isolated from the head and heated manifold by rubber.
Another thing to consider with different carbs is the setting up. Dellortos are easier to get tuned than Webers (apparently) but Webers perhaps have a slight performance edge when properly set up. I've no comparable information on Solexes.