Wossner 8582DB Piston Kit - 2004-2006 Suzuki RMZ250 / 2004-2005 Kawasaki KX250F

Wossner 8582DB Premium Forged 4-Stroke Piston Kit - Size B

Refresh the power of your 250cc racer with the Wossner 8582DB Piston Kit. Specifically engineered for the early-generation Suzuki RMZ250 and Kawasaki KX250F, this Size B forged kit is the professional choice for restoring "Factory Quality" power in cylinders that have seen standard service. At Moto-House MX, we know these shared-platform engines require precision tolerances to maintain peak RPM reliability; Wossner’s aerospace-grade forged components provide the exact fitment needed to keep your machine competitive.

Forged from aerospace-grade aluminum alloy, the 8582DB maintains a reliable 12.6:1 compression ratio, providing excellent throttle response and consistent torque. Wossner incorporates advanced features like radial boss machining and enhanced oiling slots for superior wrist pin lubrication—critical for these high-revving 4-stroke engines. The permanent skirt coating minimizes internal friction and piston rock, resulting in a quieter engine and a more efficient break-in. This Size B piston (76.97mm) is precision-matched for 77.01mm bores, perfect for an engine refresh that compensates for standard cylinder wear.

Top Features: Wossner 8582DB Piston Kit

• Size B (76.97mm): Precision-engineered for 77.01mm bores, providing the correct piston-to-wall clearance for seasoned cylinders.
• 12.6:1 Compression Ratio: Delivers a perfect balance of increased performance and long-term mechanical reliability.
• Aerospace Forged Alloy: Significantly stronger and more heat-resistant than OEM cast pistons, ideal for high-RPM motocross use.
• Enhanced Lubrication Design: Radial boss machining and annular grooves ensure the wrist pin stays lubricated during intense racing conditions.
• Low-Friction Skirt Coating: Reduces drag and mechanical noise while protecting 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 2004-2006 RMZ and KXF engines were the pioneers of the modern 250F class. Because these engines can run quite hot, a high-quality forged piston is a vital upgrade over stock. Size B is the preferred choice for a top-end refresh when your cylinder is still in good condition but has worn slightly beyond the ideal clearance for a Size A piston. When rebuilding, always inspect your valve train and cam chain, and use a fresh top-end gasket kit to ensure a professional-grade seal.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2004-2006	Suzuki	RMZ250
2004-2005	Kawasaki	KX250F

Frequently Asked Questions

Q: What is the benefit of Size B over Size A?
A: Size B (76.97mm) is 0.01mm larger than Size A. This slight increase is designed to compensate for the natural, microscopic wear that occurs on a cylinder wall over time, restoring the engine to original factory performance and compression levels.

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 essential for a professional engine rebuild.

Q: Is Wossner better than the stock piston?
A: Yes, Wossner forged pistons are denser and stronger than OEM cast parts. They are specifically designed to handle the thermal and mechanical stresses of racing more effectively than standard cast pistons.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional, leak-free seal and proper compression.
• Motorex Cross Power 4T Oil: Premium synthetic lubrication to protect your high-performance 4-stroke engine.

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.