Wossner 8707DB Piston Kit - 2008-2012 KTM 450 EXC-R XC-W / Husaberg FE FX 450 Size B

Wossner 8707DB Standard Series Forged 4-Stroke Piston Kit - Standard Size B

Refresh the powerhouse of your European off-road machine with the Wossner 8707DB Piston Kit. Specifically engineered for the high-performance 450cc engines found in 2008-2012 KTM and Husaberg models, the "Size B" piston is the professional choice for engines that have seen significant trail time. At Moto-House MX, we know that as a 450cc cylinder wears, original factory clearances can loosen; this +0.01mm Size B kit provides the precise fitment needed to restore compression and ensure a quieter, more efficient engine.

Forged from high-strength aluminum alloy, the 8707DB maintains a reliable 11.9:1 compression ratio, offering a perfect balance between aggressive power delivery and long-distance engine longevity. This kit features Wossner’s advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a vital feature for 4-stroke engines enduring long hours of dual-sport or adventure touring. The permanent skirt coating reduces internal friction and piston rock, while the specialized ring land treatment improves oil control and ring seal. This Standard Size B piston (94.96mm) is precision-matched for 95.01mm bores, bringing your KTM or Husaberg back to ideal mechanical tolerances.

Top Features: Wossner 8707DB Piston Kit

• Standard Size B (94.96mm): Specifically designed for 95.01mm bores, providing a tighter fit for cylinders with slight wear to restore peak compression.
• 11.9:1 Compression Ratio: Matches original performance specifications for reliable power delivery and compatibility with standard high-quality fuels.
• Standard Series Forging: Significantly stronger and more resilient than OEM cast pistons, offering superior fatigue resistance for high-load off-road riding.
• Enhanced Lubrication Design: Radial boss machining and specialized oiling slots ensure the wrist pin remains lubricated under intense mechanical and thermal stress.
• Low-Friction Skirt Coating: Permanent molybdenum disulphide coating protects cylinder walls and ensures a smooth break-in period.
• Complete Assembly: Kit includes the forged Size B piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The KTM and Husaberg 450cc engines are legendary for their versatility, but they require precise internal tolerances to maintain that reliability. Size B is the ideal choice for a cylinder that has been in service and shows minor wear. When performing a top-end rebuild with the 8707DB, we recommend a thorough inspection of your cam chain and tensioner. Always use a fresh top-end gasket kit and premium synthetic oil to provide a professional-grade seal and protect your new forged assembly for miles of adventure.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2008-2011	KTM	450 EXC-R / XC-W / Six Days / Champions Edition
2008-2009	KTM	450 XCR-W
2009-2012	Husaberg	FE 450 / FX 450

Frequently Asked Questions

Q: When should I use a Size B piston instead of Size A?
A: Size B (94.96mm) is used when your cylinder has minor wear. If your standard 95.00mm bore has increased slightly toward 95.01mm over time, the Size B provides the correct clearance to prevent power loss and excessive piston movement.

Q: Why choose Wossner for my KTM 450?
A: Wossner forged pistons are denser and more durable than stock cast parts. For 450cc engines used in dual-sport and off-road applications, a forged piston handles heat and mechanical stress more effectively, providing a higher safety margin during long-distance rides.

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

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional, leak-free seal and proper engine compression.
• Motorex Cross Power 4T Oil: Premium synthetic lubrication specifically designed for high-performance KTM and Husaberg 4-stroke engines.

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.