Wossner forged piston kit designed for KTM SX250 (2005-2018), EXC250 (2006-2018), Freeride 250R (2014-2020), Husqvarna TC250 (2014-2015), and Betamotor RR250 (2013-2015) models. Engineered for superior strength and optimal heat transfer, these pistons feature an elliptical design to ensure uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Includes a hard Teflon skirt coating for an optimal fit and improved conformability to the cylinder bore.

Features

• Forged piston for increased strength and durability


• Optimized heat transfer for efficient combustion chamber performance


• Elliptical design for even thrust load distribution and reduced piston collapse


• Hard Teflon skirt coating for improved fit and wear resistance

Specifications

• Bore Size: 66.40mm


• Actual Bore Diameter: 66.34mm


• Displacement: 249 cm³


• Stroke: 72.00mm


• Clearance: 0.06mm


• Wossner Compression Ratio: 2-stroke


• OEM Compression Ratio: 2-stroke


• Compression Height: 38.00mm


• Lock Part Number: CW18


• Pin Part Number: WP033


• Ring Set Part Number: RSB6640 x 2


• Rod Part Number: P2023

Cross-Reference OEM Part Numbers

• 54830007300 I


• 54830007300


• 09104861


• 856M06640

Vehicle Fitments

• KTM SX250 (2005-2018)


• KTM EXC250 (2006-2018)


• KTM Freeride 250R (2014-2020)


• Husqvarna TC250 (2014-2015)


• Betamotor RR250 (2013-2015)