Keihin FCR-MX 39 Carburetor / with Choke, Air Cut Valve, Hot Start, TPS (sku 016-927)
Amazon.com: Mixture Screw Set for Keihin FCR FCR-MX Carburetor(red) for fcr mx 39 fcr vite carburatore crf fcr 32 vite keihin carburetor air flow needle pilot screw fcr mx vm22 adjuster pz19
Amazon.com: Compatible for Carburetor for FCR MX 39 Honda CRF450R CRF450X Carb 2002-2014 : Automotive
Keihin FCR MX 39 41 assembly - YouTube
Keihin FCR MX 39 carburetor with ACV, hot start and TPS - Frank! MXParts