Wossner 8587DC Piston Kit - 2004-2017 Honda CRF250X / 2004-2005 CRF250R Size C

Wossner 8587DC Premium Series Forged 4-Stroke Piston Kit - Size C

Revitalize your Honda’s Unicam engine with the Wossner 8587DC Piston Kit. Specifically engineered for the versatile 2004-2017 Honda CRF250X and the 2004-2005 CRF250R, this Premium Series forged kit is the professional choice for restoring "Factory Quality" power in cylinders that have seen extended service. At Moto-House MX, we know that 250cc 4-strokes demand precision to maintain their high-revving nature; Wossner’s aerospace-grade forged components provide the exact fitment needed to keep your Honda reliable on the trail or the track.

Forged from aerospace-grade aluminum alloy, the 8587DC maintains a performance-oriented 12.9:1 compression ratio, offering a crisp throttle response and strong mid-range pull. This piston features advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical upgrade for the thermal demands of a 250cc racing engine. The permanent skirt coating minimizes internal friction and piston rock, resulting in a quieter engine and a more controlled break-in. This Size C piston (77.97mm) is precision-matched for 78.02mm bores, making it the perfect choice for an engine refresh that compensates for natural cylinder wear in seasoned machines.

Top Features: Wossner 8587DC Piston Kit

• Size C (77.97mm): Precision-engineered for 78.02mm bores, restoring factory-spec clearances in cylinders with measurable wear.
• 12.9:1 Compression Ratio: Delivers high-performance power while remaining compatible with premium pump fuel.
• Premium Series Forging: Significantly stronger and more heat-resistant than OEM cast pistons, ideal for the high-RPM stress of 250cc racing.
• Enhanced Lubrication Design: Radial boss machining and specialized oiling slots ensure the wrist pin stays lubricated during intense riding.
• Low-Friction Skirt Coating: Permanent coating reduces 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 Honda CRF250X and early CRF250R utilize a unique Unicam head design. When performing a top-end refresh with the 8587DC, always inspect your intake valves, as they are a known wear item on these models. Size C is the preferred choice for a refresh when your cylinder is still in good condition but has worn beyond the ideal clearance for Size A or B pistons. Using a fresh top-end gasket kit and premium synthetic oil is essential to ensure your new forged piston performs at its peak for many hours to come.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2004-2017	Honda	CRF250X
2004-2005	Honda	CRF250R

Frequently Asked Questions

Q: When should I choose a Size C piston?
A: Size C (77.97mm) is designed for cylinders that have seen a high amount of use and have worn slightly larger than the original factory bore. This size restores the proper piston-to-wall clearance (0.05mm), preventing piston slap and maintaining maximum compression.

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.

Q: Is Wossner better than the original Honda piston?
A: Yes, Wossner forged pistons are denser and stronger than OEM cast parts. They are designed to handle the thermal and mechanical stresses of high-performance riding more effectively, providing superior durability for your CRF.

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 4-stroke race 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.