Wossner 8967DB Piston Kit - 2020-2026 Honda CRF250R CRF250RX CRF250RWE Size B

Wossner 8967DB Premium Series Forged 4-Stroke Piston Kit - Standard Size B

Push the limits of your Unicam engine with the Wossner 8967DB Piston Kit. Engineered for the 2020-2026 Honda CRF250R and CRF250RX, as well as the elite CRF250RWE, this "Size B" forged kit is the professional choice for riders performing a top-end refresh on a cylinder with moderate hours. At Moto-House MX, we know that modern Honda 250s thrive on high-RPM efficiency; Wossner’s Premium Series forging delivers a high-strength, lightweight solution that sustains a powerful 13.9:1 compression ratio for maximum holeshot potential.

The 8967DB is a masterclass in 4-stroke engineering, featuring enhanced piston pin oiling slots and radial boss machining to ensure the wrist pin stays lubricated during extreme racing conditions. To maximize performance, Wossner includes a specialized ring land treatment for superior oil control and compression sealing. The skirt is treated with a permanent coating that minimizes friction and prevents piston rock, ensuring a quieter, smoother-running engine. Precision-machined for 79.01mm bores, this 78.97mm Size B piston provides the exact tolerances needed to restore your Honda’s powerband without sacrificing reliability.

Top Features: Wossner 8967DB Piston Kit

• Standard Size B (78.97mm): Precision-machined for 79.01mm bores to compensate for minor cylinder wear and restore factory-spec clearances.
• 13.9:1 Compression Ratio: Optimized for high-performance delivery, providing crisp throttle response and improved torque across the range.
• Premium Series Forging: Double-bridged design (where applicable) provides incredible structural integrity and heat resistance for high-RPM motocross use.
• Advanced Lubrication System: Enhanced oiling slots and annular grooves ensure consistent wrist pin lubrication under extreme thermal loads.
• Low-Friction Skirt Coating: Permanent skirt treatment reduces internal drag and protects the cylinder wall for a more efficient break-in.
• Complete Rebuild Kit: Includes the high-performance forged Size B piston, rings, wrist pin, and pin locks.

Expert Pro-Tip: The Honda CRF250R is a high-performance racing machine that requires perfect mechanical tolerances. When your cylinder measures slightly beyond the original Size A spec, moving to a Wossner Size B (78.97mm) is the expert way to maintain the tight piston-to-wall clearance necessary for peak horsepower. Always use a precision bore gauge to confirm your cylinder measures 79.01mm before installation. For a professional-grade rebuild, always install with a fresh top-end gasket kit and utilize premium synthetic oil to protect your forged assembly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2020-2026	Honda	CRF250R
2020-2026	Honda	CRF250RX
2025-2026	Honda	CRF250RWE

Frequently Asked Questions

Q: Why should I choose Size B for my Honda?
A: Size B (78.97mm) is 0.01mm larger than Size A. It is the standard professional choice for a second or third top-end rebuild to account for microscopic cylinder wear, ensuring you maintain maximum compression and avoid piston slap.

Q: Is this compatible with the Works Edition (RWE)?
A: Yes, this kit is fully compatible with the 2025-2026 Honda CRF250RWE, providing the durability and performance required for "Works" level racing.

Q: Does this piston require race gas?
A: With a 13.9:1 compression ratio, it is recommended to use high-quality 91+ octane pump gas or a race fuel blend to ensure consistent combustion and prevent detonation under heavy loads.

Recommended Pairings

• Complete Top End Gasket Set: Vital for maintaining a perfect seal and correct squish heights on your CRF.
• Premium 4-Stroke Synthetic Oil: Ensure your new forged piston and valvetrain stay protected in high-heat racing environments.

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.