This listing is for a used 38mm Mikuni round slide carburetor,  original application was for a Ski Doo Mach 1. Part  number for this carburetor is 403132400.

The carb is in good condition, very clean and everything came apart nicely, nothing stuck. The needle that goes in the middle is chipped. (last picure)

The parts inside the carb are as follows

50 Pilot jet
300 Main Jet
P-9 480 Needle jet or Nozzle
6DEY2 Needle
2.5 Cutaway slide

Carb is stamped 38B and 393 by the choke plunger hole and H7 8 1 by the air/fuel screw.

Looked the part number up online and found that this will fit the following machines, may fit others too