PISTON KIT 05-18 KTM 250 66.40, WOSSNER 8169DA SX, EXC, 54830007300

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)