Keihin FCR MX 39mm carburetor removed from a 2005 450EXC with 93 hours time. This carb has TPS. It has a 48mm O.D. outlet neck and a 64mm O.D. removable inlet flange. Currently has 172 main, 42 pilot and 85 air jet installed. The carb has 3900A DS012 etched into the carb body. It has a JD Jetting kit installed and the remainder of the kit is inclued with the carb. This carb is very clean inside and came from a fully functionally bike. Please check fitment prior to purchase.