Replacement Carburetor starting adjustments

[mikes5785]

I'm getting ready to replace the carburetors on both my cub lowboys. What should the starting mixture & idle screw adjustments to get them both started?



Thanks

Mike

[Bob McCarty]

Mike, Are they IH carbs or Zenith?

Bob

[staninlowerAL]

Bob has you on the right track. IH carb jet is fixed and the air adjustment is all you can do except the idle rpm adjustment.

[Don McCombs]

Why are the carburetors being replaced?

[Glen]

Hi,
Here is a page from the Cub owner's manual telling how to adjust the idle mixture screw on the IH carburetor, at the lower left of the page.
I have found that it usually needs to be about 1 1/2 turns open. Yours could need less or more.

http://farmallcub.com/rudi_cub/www.clea ... age-22.jpg

[mikes5785]

I recently purchased a Lowboy with a carb that had the fuel inlet threads/casting busted and repaired with JB weld and then fuel line installed cross threaded and my 55 Low boy leaks like a sieve

Mike

Why are the carburetors being replaced?

[mikes5785]

I believe that both the old carbs are IH. I got both replacements from Steiner and they both should be IH

Thanks

Mike

Mike, Are they IH carbs or Zenith?


Bob

[Bob McCarty]

Save those carbs, there is a good chance both can be repaired. Glen has you covered on settings. May need a little fiddling to find the sweet spot.


Bob

[ScottyD'sdad]

I'd change the inlet needle valves, to the metal IH ones, right away, or at least order them, since the rubber tipped ones will leak, within a few months.
Ed