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VERTEX Piston Kit Cast Replica for 2-Stroke (KTM 250SX) Restore your 2-stroke performance with the VERTEX Piston Kit Cast Replica designed as a cast OE replacement for KTM 250SX applications. Built for reliable off-road power and consistent fit, this kit delivers quality components to help refresh cylinder wear and maintain proper compression. Key Features Heat-treated piston using a T-5 hardening and tempering cycle for durability. Molybdenum Disulphite (MoS₂) skirt coating to support faster break-in and extend piston life. Gravity-cast aluminum alloy with 18% silicone for stability under use. Cast OE replacement design for a precise, dependable fit. Complete kit includes: piston, rings, wrist pin, and circlips . Specifications Brand: VERTEX Product Type: Piston Kit (Units: Kit) Cylinder Diameter: 66.40 mm Piston Diameter: 66.35 mm Engine Type: 2-Stroke Displacement: 250 cc Model: Cast Replica Riding Style: Off-Road Skirt Coating: Molybdenum Disulphite Compression Ratio: Standard Piston Material: Cast Aluminum Alloy Package Weight: 0.71 lbs • Dimensions: 4.05" x 3.14" x 3.03"
Piston is heat treated with a T-5 hardening and tempering cycle
Piston skirt is coated with a high-tech Molybdenum Disulphite coating for faster break-in time and increased piston life
Gravity-cast aluminum alloy (not forged) with 18% silicone content
Cast OE replacement piston
Kit includes piston, rings, wrist pin and circlips