I want to activate the choke on a 3W75 with a servo. The choke actuating arm locks into position when open. How do I alter the choke arm mechanically to overcome the detent? It looks like I need to install an extension arm on the choke at 90 degrees so the arm will swing thru a 30-45 degree arc from closed to open. Does anyone have a tried and true setup for this situation? Will a standard servo have enough torque to pull the choke out of the open position to closed?

I've done this on four gas engines using a HS-225 Mini servo with no problems. I make a arm out of 3/4" wide K&S brass strip. I drill a 3/16" hole that fits over the shaft, a 1/8" hole for a short bolt to lock the brass strip to the short choke arm and another smaller hole about 3/4" from the shaft to bolt a swivel ball link for the control arm to the servo. The choke shaft projects above the choke arm enough to keep the new arm in place. The brass is cut with tin snips and holes drilled to give smoth operation. I use the retract channel to operate the choke. I leave the detent in place, the servo dosen't have a problem with it.
Evert

Evert........thanks for the help

Bob