D4 carby help needed

Just a reminder..... BOTH the high speed mix adjustment screw AND the low speed mix adjustment work opposite from other small motor carbs. The useful range of adjustment on the idle mix will be pretty tight around the 1/2 turn open starting point.

What adjustments do you need to make?

Do you think you might have originally had the throttle linkage installed with the control rod finger not hooked behind the linkage pin extension so the rod could not pull against the governor spring. This would allow the pony to run only at high idle speed with no way to slow it down except with the choke as you mention.

I have had pony governors frozen solid as Eddie describes. In my case I took the back cover off and cleaned up things from that end as well. Pretty simple mechanism and even less to loose in that end as I remember it. I expect most of them can be loosened up by spraying the shaft where it comes through the casing with some sort of penetrating oil, but I didn't know that at the time!

My pony throttle rod tang can slip past the throttle shaft tang pretty easily. The throttle rod tang should be on the far side of the throttle shaft tang, so that as you pull the throttle knob out, you close the throttle shaft (against the governor's wishes). When the throttle rod is pushed right in, it basically has no contact with the throttle shaft tang.

In your initial post you mentioned the "Float will stick a little". Could be the float is out of adjustment or the needle and seat are shot or the needle sticks occasionally.

My pony throttle rod tang can slip past the throttle shaft tang pretty easily. The throttle rod tang should be on the far side of the throttle shaft tang, so that as you pull the throttle knob out, you close the throttle shaft (against the governor's wishes). When the throttle rod is pushed right in, it basically has no contact with the throttle shaft tang.