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...tem150225796442

You'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_.html

A 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