Re: Metering rod for Carter WDO 531 S

Posted by DavidPackard On 2020/10/7 14:06:24

For a Carter WDO Parts List 531S - Metering Rods

75-538 Superseded by 75-616
75-539 Lean 1 Superseded by 75-639
75-540 Lean 2 Superseded by 75-640

Carter had the nasty habit of changing the diameters of both the secondary venturi, and main venturi that results in unique combinations of venturi size, area ratios, main jets and metering rods. There also seems to be a host of vacumeter springs available.

I have yet to find a metering rod from another parts list that would have the correct geometry, but I will put my nose to the grindstone this evening.

What is the number on the metering rod(s) you have?