Polaris Mikuni flat slide TM40 carburetor rack, part number 1253288 which I believe was original to a 2000 Polaris RMK 800. Carbs were being used on a 1998 Polaris Indy XC 700 so the calibration is likely not original. Size 420 main jets, idle and mixture screws operate, needle/seat assemblies seem to be sealing currently. Machine seemed to run fairly well with these carbs on it but I would certainly recommend a thorough inspection, cleaning, and ensure proper calibration for your machine. What is pictured is what will be included. Please check to be sure these are what you want before purchasing.