Wossner 8057DA Piston Kit - 1999-2000 Kawasaki KX125 Standard Size A

Wossner 8057DA Standard Series Forged 2-Stroke Piston Kit - Standard Size A

Restore the hard-hitting power of your classic Kawasaki with the Wossner 8057DA Piston Kit. Specifically engineered for the 1999-2000 KX125, this Standard Size A forged kit is the premier choice for riders looking to maintain factory-spec performance with modern durability. At Moto-House MX, we know that keeping these legendary 2-strokes on the track requires high-quality internals; Wossner’s aerospace-grade forged construction provides a massive strength advantage over traditional cast pistons, ensuring your KX125 can handle high-RPM motocross use.

Forged from high-silicon aluminum alloy, the 8057DA features a performance-oriented single-ring design. This configuration is preferred by racers for reducing friction and allowing the engine to rev more freely, capturing that aggressive powerband the 1990s-era KX is famous for. To ensure maximum longevity, Wossner applies a permanent molybdenum disulphide skirt coating that reduces internal drag and prevents piston rock. Precision-machined for standard 54.00mm bores, this Size A (53.95mm) piston kit provides the exact tolerances needed for a professional engine refresh.

Top Features: Wossner 8057DA Piston Kit

• Standard Size A (53.95mm): Engineered for factory 54.00mm bores to maintain the precise piston-to-wall clearance required for peak efficiency.
• Single Ring Design: Reduces internal friction and reciprocating mass, allowing for faster revving and improved top-end performance.
• Aerospace-Grade Forging: Significantly stronger and more heat-resilient than OEM cast alternatives, providing superior structural integrity.
• Low-Friction Skirt Coating: Permanent molybdenum disulphide treatment minimizes drag, protects the cylinder, and ensures a quieter running engine.
• Optimized Lightness: Precision machining maintains strength in critical areas like the crown while shedding unnecessary weight for improved throttle response.
• Complete Racing Kit: Includes the high-performance forged piston, single ring, wrist pin, and circlips.

Expert Pro-Tip: The 1999-2000 Kawasaki KX125 is a favorite among vintage and evolution-class racers. To get the most out of your rebuild, ensure your cylinder plating is in good condition. Size A is the correct choice for a freshly replated cylinder or one that still measures exactly at the factory 54.00mm bore. Always verify your ring end gap before installation. For the best results, install with a fresh top-end gasket kit and use premium synthetic 2-stroke oil to keep your new forged assembly protected during break-in and beyond.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
1999-2000	Kawasaki	KX125

Frequently Asked Questions

Q: Is a forged piston better for older bikes like the 1999 KX125?
A: Absolutely. Forged pistons are much denser and less likely to shatter under extreme stress compared to older cast piston designs, making them a safer and more durable choice for vintage racing.

Q: What are the benefits of a single ring?
A: A single-ring setup is designed for pure performance. It creates less drag against the cylinder wall than a dual-ring setup, which helps the engine rev faster and stay in the "meat" of the powerband.

Q: Will this fit my 2001 or newer KX125?
A: No, this specific kit is precision-matched for the stroke and bore requirements of the 1999-2000 models. Always verify your model year before purchasing.

Recommended Pairings

• Complete Top End Gasket Set: Essential for maintaining a perfect seal and correct squish heights on your KX125.
• Motul 800 2T Factory Line: High-performance lubricant to ensure your new forged piston stays protected at high RPMs.

Restore your machine’s power and precision today. Buy now at Moto-House MX!

Moto-House MX – Choice of Champions – is located in Clermont/Montverde, FL. The Best Motocross/UTV & ATV Shop in Central Florida. Stop by our local store in Montverde, FL or enjoy lightning-fast shipping across the USA.