I asked about misfires/ skipping/ and stumbling (really just the 1st!)
On my '46 Willys Jeep (my avatar)
I bought and installed new points, I was told they were the "Cat's Meow", by the parts fellers!
They were "Vented Points", meaning they had a hole thru both "anvils". Two little metal doughnuts, smacking each other!
They ran OK for about 500 miles, then I developed a constant stumble, felt both at idle and at speed
Filing/ readjusting/ even trying to bend the anvils to mate more evenly did not help.
I'm gullible! I replaced with the same thing. Same problem
Never will use 'em again!
Your problem really sounds like idle mixture or combustion air. Too much or too little---Not Stumbling----The reason you cannot get your speed down, is it's running on the Mains (adequate fuel air mixture there)
When you close the throttle plates to lower your speed. Soon as you get into the idle circuit. Correct fuel air mix is un-acheievable!
Was there Never a PCV on that thing originally? Or you just didn't stick one on?
If the carb is ported for that amount of air, that the PCV would provide, you need to install one. If it never had one, and your carb is an exact replacement, Not a more modern carb. Your combustion air at idle, w/o PCV should be calibrated to the "Old Carb"
Confuse you with all that?
Adjusting your mixture screws at 1200 RPM, is probably doing very little to get the idle mix right, probably not even close. You gotta get the speed down, off of your mains and onto your idle circuit.
Saturday, July 2nd, 2011 AT 3:59 AM