PISTON KIT KTM 520 525 EXC SX, WOSSNER 8637DB KTM 00-09 HC

Wossner high-compression forged piston kit designed for KTM SX-EXC520 (2000-2002), SX-EXC525 Racing (2003-2007), and Beta Motor RR525 (2005-2009) 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. Manufactured in Germany.

Features

• High-compression forged piston for increased performance
• Optimized heat transfer for efficient combustion chamber performance
• Elliptical design for even thrust load distribution and reduced piston collapse
• Manufactured in Germany

Specifications

• Bore Size: 95.01mm
• Actual Bore Diameter: 94.96mm
• Displacement: 510 cm³
• Stroke: 72.00mm
• Clearance: 0.05mm
• Wossner Compression Ratio: 12.50:1
• OEM Compression Ratio: 11.00:1
• Dome Volume: +4.60 cm³
• Compression Height: 23.50mm
• Lock Part Number: CW20
• Pin Part Number: WP029
• Ring Set Part Number: 950ADS-2

Vehicle Fitments

• KTM EXC520 (2000-2002)
• KTM SX520 (2000-2002)
• KTM EXC525 Racing (2003-2007)
• KTM SX525 Racing (2003-2007)
• Beta Motor RR525 (2005-2009)

Dispatch Times

Local Stock: Dispatches in < 24 hours

Parts showing as available at our Warehouse in Gorey ship the same business day if ordered before 1pm. 

Supplier Stock: Dispatches in 2-4 Days

Parts showing as available at our Supplier Warehouse are ordered from our supplier and delivered to us before we can dispatch. More info is available on this page under "Stock Availability".

OEM Special Order: Dispatches in 3-10 Days

This website does not have access to live stock levels from our OEM Suppliers. In most cases the parts will be available but in the case of backordered parts we will notify you. We receive parts from Yamaha in 3-4 days, All others including Honda, Suzuki, Kawasaki, Polaris please allow 7-10 days for us to receive the parts. 

Delivery Times

Ireland & Northern Ireland:

1-2 Days using GLS/An Post

Germany, France, Netherlands, Belgium:

3-5 Days using GLS/Fedex

Italy, Spain & Other EU Countries:

4-7 Days using GLS/Fedex