Wossner Piston Kit 53.95mm Yamaha YZ125 2005-2021 8302DA

The stock piston in your YZ125 is subject to constant thermal stress and detonation cycles that accelerate wear—especially if you're pushing higher RPMs or running aggressive jetting. A quality replacement piston kit restores compression, eliminates ring blow-by, and brings back the snappy throttle response your bike had when it was new. The Wossner 8302DA is engineered specifically for your machine, so you get exact fitment and proven durability without guesswork.

This kit combines aerospace-grade aluminum with a friction-reducing skirt coating to lower operating temperatures and extend ring life. The precision-machined design minimizes piston rock, which translates to quieter operation and more consistent power delivery across the entire powerband. Whether you're rebuilding after a top-end failure or upgrading a higher-mileage engine, this is the piston choice that lets you trust your engine again.

• Bore diameter: 53.95mm
• Yamaha YZ125 2005–2021
• Aerospace-grade aluminum alloy
• Advanced skirt coating
• Reduced piston rock
• Complete kit included
• Bolt-on installation
• MPN: 8302DA