PISTON KIT 02-07 KTM EXC450 89 WOSSNER WOSSNER 8581DA

Wossner forged piston kit with an 89mm bore, designed for KTM EXC 450 Racing, Beta RR450, and Polaris Outlaw 450 MXR models. Engineered for optimal combustion chamber heat transfer and uniform bearing surface under heat expansion, reducing localized pressure and piston collapse. Manufactured in Germany for durability and precision.

Features

• Forged piston for superior strength and design
• Optimized heat transfer to cylinder walls
• Elliptical design for uniform bearing surface and even thrust load distribution
• Manufactured in Germany

Specifications

• Bore: 89mm
• Standard size piston (PN# 8581DA)
• Lock Part Number: CW20
• Pin Part Number: WP038
• Ring Set Part Number: 890XSY
• Displacement: 449 cm³
• Stroke: 72.00mm
• Clearance: 0.04mm
• Wossner Compression Ratio: OEM
• OEM Compression Ratio: 11.10:1
• Dome Volume: +7.10 cm³
• Compression Height: 23.50mm

Cross-Reference OEM Part Numbers

• 59430007000
• 4941M08900

Vehicle Fitments

• KTM EXC 450 Racing (2003-2007)
• Beta RR450 (2005-2009)
• Polaris Outlaw 450 MXR (2008-2011)

Majority of our listings are for a direct replacement for your original part.

Our parts are made of quality and are designed to meet or exceed the original OEM Standards.

Our products are often a cost effective alternative to genuine OEM Parts.

Please note: the models of bike we state in our listings are for general guidance only. Please make sure this item will fit your bike before purchasing. Also, we cannot guarantee fitment to any non-UK models.