While you have the covers off of the chokes you should check to see if the cold idle cam on the rear carb is clean and moving free. I overlooked that little bugger in the past and had some issues getting it just right. If you can get it properly set, the chokes and cold idle work together - the result is that you can start in sub zero temp and hit the road in no time.

At a minimum, you will want to verify that all parts are there and clean. Use some dry lube and tighten the return spring (which is a coil spring that keys to the brass bushing #37 in diagram). Then when you put the choke plate back on, make sure to catch #35 with the bimetal spring and rotate into place.

Here is a link to the diagram for reference:

http://i151.photobucket.com/albums/s131/Blue72W114/CarbINAT32.jpg

good luck