hi just a comment , that adjustment is supposedly not to vary rod fit , but rather to center or phase angle of choke “ change rate with temp . “ That involves how fast the spiral unwinds vs angle of arm on choke axle There were warnings in later moper FSM “ do not adjust , factory set of spiral “
I admit to having done so , chasing warm up stalls, before I knew that That warning might have been in 67 dart FSM . it has a very long rod that works at an angle ( slant six) if rod is not quite right on ram bending is way to go . All this sets rate it opens which in turn sets fast idle All carter heat spirals are most likely the same ( mho) but rate is and zero position at room temp is calibrated at factory . I have used others by extending rod using solder and elecrical non insulated barrel crimp splice or small tubing like brake or copper Ymmv , just info .
On Jan 27, 2026, at 6:10 PM, 'Jay Williamson' via Chrysler 300 Club International <chrysler-300-club-international@xxxxxxxxxxxxxxxx> wrote:
I thing you guys may be onto something. The rod on the new part looks like it could be shorter than the original. I adjusted the spring to take some of the slack (free travel) off of the spring. Now the butterfly is closed
Thank you Jay Sent from my iPad On Jan 27, 2026, at 5:22 PM, Jay Williamson <letterpressman@xxxxxxxxxx> wrote:
Oh, I see that now. So it would make sense to turn it to the rich side to close the butterfly? Here is a picture of the one that I replaced Jay Williamson 317-223-1379
On Jan 27, 2026, at 5:15 PM, Jay Williamson <letterpressman@xxxxxxxxxx> wrote:
Hello,
I don’t recall where I ordered it, but here is the box it came in. Guess there is a possibility that the part may not go with the box though. It matches up perfectly with the one I took off the car <image0.jpeg> Jay Williamson 317-223-1379
On Jan 27, 2026, at 4:45 PM, Marshall Larson <granitledge@xxxxxxxxx> wrote:
There are normally two ways to adjust the cold start choke setting. First, the choke bimetal spring in the unit that sits in the manifold should be adjustable via the screwdriver slot in the axle of the spring. Usually there are markings on the disk for rich and lean. The second method is to bend the linkage rod so that it is more or less straight to change it's length. Hope this helps.
-- Marshall Larson
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