Well, now I'm reduced to replying to my own threads .. LOL
Since doing all that other websurfing, I stumbled across this RC unit which will work from 12 volts directly, do away with the RC servo, and allow you to control a DC motor position directly.
Here's the link to the RC unit.
http://cgi.ebay.com/12V-DC-motor-bidirec...tem150225796442You'll use that to drive a geared DC motor like this one with an arm added to run to the choke lever.
http://www.allelectronics.com/cgi-bin/item/DCM-276/400400/5_RPM_GEAR_MOTOR,_12VDC_.htmlA much simpler process all round ... what's the expression? Too late we grow smart, too soon we grow old?
How's that one sound Brettski?
Lee