I don't run any chokes but it is a lot warmer here, even than your Spring/Summer months. In a few minutes they warm up enough to run. They used to sell manual choke conversion kits that consisted of the round plastic part that goes on your carb, a little arm, some clamps and a choke cable. Some of those are still available, although I haven't seen them in years. In the 60's and 70's I used a few of these and they were fine, as long as you remembered to push the choke in after it warmed up.

Here is just one I found on the internet:

http://www.jcwhitney.com/jcwhitney/p...29&zmap=15632G

Don