Exact fit A, B or C pistons match your cylinder bore perfectly to maximize power and performance, while reducing blow-by and oil consumption. All piston kits include piston, rings, wrist pin and circlips required. Skirts are coated with a hi-tech molybdenum disulphide (MoS2) for faster break-in and increased piston life Heat treated with T-5 hardening and tempering cycle Restore dependable engine performance with the Vertex Pistons 22991B Cast Replica Piston Kit, designed for select KTM two-stroke powersports applications. This kit uses an exact-fit A, B, or C piston selection to closely match the cylinder bore, helping maximize power and performance while reducing blow-by and oil consumption. It is a practical replacement solution for riders and technicians rebuilding compatible KTM engines.The Vertex Pistons 22991B kit includes the piston, piston rings, wrist pin, and circlips required for installation. The piston skirts feature a high-tech molybdenum disulfide (MoS2) coating that supports faster break-in and helps increase piston service life. This coating is engineered to reduce friction during initial operation and promote smooth movement within the cylinder.Each piston is heat treated using a T-5 hardening and tempering cycle for added durability under demanding riding conditions. The cast replica design provides a reliable replacement for worn or damaged components while maintaining the fit and performance characteristics required by the original application. Always verify cylinder classification and engine compatibility before installation.This Vertex Pistons piston kit fits select 2004 through 2009 KTM models, including the KTM 105 SX, KTM 105 XC, and KTM 85 XC. It is intended for powersports use and is not emissions-approved for on-road or regulated applications. Professional installation and proper piston-to-cylinder clearance checks are recommended.Features:Exact-fit A, B, or C piston selection matches the cylinder bore for optimized power and performanceHelps reduce blow-by and oil consumptionPiston skirt features a molybdenum disulfide (MoS2) coating for faster break-in and increased piston lifeHeat treated with a T-5 hardening and tempering cycle for enhanced durabilityComplete kit includes piston, rings, wrist pin, and circlipsFits select 2004-2009 KTM 105 SX, 105 XC, and 85 XC models