Wossner 8547DA Piston Kit - KTM 520 525 EXC/SX Beta RR Polaris Outlaw 525

Wossner 8547DA Premium Series Forged 4-Stroke Piston Kit - Standard Size A

Revitalize the legendary RFS power plant in your KTM, Beta, or Polaris with the Wossner 8547DA Piston Kit. Specifically engineered for the high-torque 520cc and 525cc 4-stroke engines, this Premium Series forged kit is the professional choice for restoring Factory Quality performance. At Moto-House MX, we understand the longevity and versatility of these engines; Wossner’s aerospace-grade forged components provide the enhanced durability needed for everything from motocross racing to long-distance adventure touring.

Forged from aerospace-grade aluminum alloy, the 8547DA maintains a reliable 11.0:1 compression ratio, mirroring the versatile power delivery these machines are known for. This piston includes advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical upgrade for ensuring engine longevity under heavy loads. The permanent skirt coating reduces internal friction and piston rock, providing a quieter-running engine and a safer break-in period.

Top Features: Wossner 8547DA Piston Kit

• Standard Size A (94.95mm Piston): Precision-engineered for 95.00mm bores to maintain factory-spec clearances and efficiency.
• 11.0:1 Compression Ratio: Balanced design that delivers smooth, tractable power while remaining reliable for dual-sport and ATV applications.
• Premium Series Forging: High-strength aluminum construction offers superior thermal resistance compared to cast pistons.
• Enhanced Lubrication: Specialized oiling slots and annular grooves ensure the wrist pin stays lubricated during high-load operation.
• Low-Friction Skirt Coating: Permanent coating minimizes drag and protects your cylinder walls from premature wear.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The KTM RFS engine is world-renowned for its durability, but at this stage in its life, a high-quality top-end refresh is the best way to prevent catastrophic failure. When installing the 8547DA, always inspect your intake and exhaust valves for wear and ensure your cam chain is within service limits. Using a fresh top-end gasket kit and premium synthetic oil is essential to protect your investment and maintain peak compression for years to come.

Fitment List

Brand	Models	Year Range
KTM	520 SX / EXC | 525 SX / EXC / MXC / SMR / XC-G	2000-2007
KTM (ATV)	525 XC ATV	2008-2012
Polaris	Outlaw 525 (S & IRS)	2007-2011
Beta	525 RR 4T	2005-2009

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 94.95mm piston designed for the standard 95.00mm bore. It is the correct choice for cylinders that are still within factory service limits.

Q: Does this kit include the gaskets?
A: No, the kit includes the forged piston, rings, wrist pin, and locks. A top-end gasket kit is sold separately and is required for a professional reassembly.

Q: Can I use this in my Polaris Outlaw 525?
A: Absolutely. The Polaris Outlaw 525 uses the KTM-sourced RFS engine, making this Wossner kit a perfect high-performance replacement for the OEM piston.

Recommended Pairings

• Complete Top End Gasket Set: Required for a professional, leak-free engine rebuild.
• Motorex Cross Power 4T Oil: The ideal synthetic lubrication for high-performance KTM and Beta 4-stroke engines.

Restore your engine’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.