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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.
David Bartlett
Pine Tree Boating Club Chapter
"I don't fully understand everything I know!"