1947  4423 .. 3.3hp  . must be similar to a HD  or TD ..?

you would  need some leather  seals for the primer pump and  a float (Merc floats can be fitted)

the rest is mostly cleaning   maybe cutting your own gasket     …see poche family site and Johnson  redbook

Basic Carburetor Servicing Johnson H and T Series (pochefamily.org)

crosbyman wrote:

1947  4423 .. 3.3hp  . must be similar to a HD  or TD ..?

you would  need some leather  seals for the primer pump and  a float (Merc floats can be fitted)

the rest is mostly cleaning   maybe cutting your own gasket     …see poche family site and Johnson  redbook

Basic Carburetor Servicing Johnson H and T Series (pochefamily.org)

This carb is nothing like the one on a TD or HD,  Totally different animal. Supposedly the first carb designed using a computer, back in the day. It is unique.  Biggest issue is primer cups are hard to come by.

Adjustment needle is very blunt, so a little bit of adjustment goes a LONG way. Adjust this one very slowly.