I believe this carb is from either a  KX125 1980-81 or a KDX175 1980-1982 , The airbox boot that came from it was part numbered 14073 1066 and it cross references with those models , It is a 38mm Mikuni MX carb so may fit other bikes  

Stamped 147 over 8 on one side and Q1 over something that is too faint to read on the other side , the main nozzle/jet holder is stamped 372 over R-2 , The ID on engine side measured with a manual vernier is 38.5mm 

Missing slide , top , needle , spring and pilot jet , the pilot jet threads are in good condition as I checked using another jet 

What is here is good condition with nothing seized or broken , choke is working as it should 

Feel free to message me for any more information

SL U3