REBUILD KIT, CARBURETOR, MIKUNI BST40 W/O TPS, KTM LC4. This contains the same parts as the 584.31.099.000 GASKET SET MIKUNI BST40-225 except the diaphragm, but plus the float needle, which normally only comes as part of 584.31.020.000 NEEDLE VALVE 2,8MM (usually no need for the assembly, as the seat goes bad infrequently), and throttle blade screws. Full list of parts contained in the kit: Japanese-made float needle & pilot fuel screw o-ring, genuine Mikuni float bowl gasket & cold start slide retainer to cable seal, needle seat o-ring, cold start enrichment feed pipe o-ring, main jet access plug o-ring, slide guide o-ring, two felt throttle shaft seals, two stainless steel flat hexalobular throttle blade screws and instructions. All o-rings in this kit are FKM. NBR vs. FKM o-rings