The Athena S5F05300001A Piston Kit is a precision-engineered replacement assembly for compatible Yamaha YZ85 two-stroke motorcycles. This B-bore Cast Lite piston is designed with a 52.95 mm piston size and a 13.8:1 compression ratio, supporting dependable engine performance for motocross and off-road applications. The lightweight cast construction helps provide a responsive engine feel while maintaining the durability required for demanding riding conditions.
This piston kit is manufactured by Athena and supplied under vendor part number S5F05300001A. It is designed to fit 2002–2011 Yamaha YZ85 models, including the 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, and 2011 model years. Confirm the existing piston specification, cylinder condition, and required service clearances before installation to ensure proper compatibility and engine life. Professional installation and adherence to Yamaha service procedures are recommended.
Built as a direct replacement component for applicable engines, the Athena Cast Lite piston kit is suited for riders and technicians restoring performance or replacing a worn piston assembly. Its application-specific design helps simplify fitment while supporting consistent combustion and reliable operation when installed with the correct related components and clearances.
Features:
- Brand: Athena
- Manufacturer: Athena
- Vendor Part Number: S5F05300001A
- Piston Size: 52.95 mm
- Piston Type: B-bore Cast Lite
- Compression Ratio: 13.8:1
- Fitment: 2002–2011 Yamaha YZ85
- Application: Replacement piston kit for Yamaha YZ85 two-stroke motorcycles
Fitment:
2002 Yamaha YZ85
2003 Yamaha YZ85
2004 Yamaha YZ85
2005 Yamaha YZ85
2006 Yamaha YZ85
2007 Yamaha YZ85
2008 Yamaha YZ85
2009 Yamaha YZ85
2010 Yamaha YZ85
2011 Yamaha YZ85
2012 Yamaha YZ85
2013 Yamaha YZ85
2014 Yamaha YZ85
2015 Yamaha YZ85
2016 Yamaha YZ85
2017 Yamaha YZ85
2018 Yamaha YZ85
2019 Yamaha YZ85
2020 Yamaha YZ85
2021 Yamaha YZ85
2022 Yamaha YZ85
2023 Yamaha YZ85
2024 Yamaha YZ85