Wossner 8775DA Piston Kit - 2010-2013 Honda CRF250R Standard Size A

Wossner 8775DA Pro Series Forged 4-Stroke Piston Kit - Standard Size A

Push your Unicam engine to the limit with the Wossner 8775DA Piston Kit. Specifically engineered for the 2010-2013 Honda CRF250R, this Pro Series forged kit is designed for racers who demand maximum power and elite-level reliability. At Moto-House MX, we know the CRF250R thrives on high-RPM performance; Wossner’s Pro Series construction provides the structural integrity and advanced lubrication features necessary to keep your Honda at the front of the pack.

Forged from high-strength aluminum alloy, the 8775DA features a high-compression 14.2:1 ratio, delivering increased torque and sharper throttle response throughout the powerband. This kit incorporates Wossner’s advanced radial boss machining and enhanced oiling slots to ensure the wrist pin stays lubricated during the most intense racing conditions. The permanent molybdenum disulphide skirt coating reduces internal friction for a quieter engine and smoother break-in, while specialized ring land treatments ensure a superior oil seal. This Size A piston (76.76mm) is precision-matched for standard 76.80mm bores, providing factory-tight tolerances for a professional top-end rebuild.

Top Features: Wossner 8775DA Piston Kit

• Standard Size A (76.76mm): Precision-engineered for 76.80mm bores to maintain ideal piston-to-wall clearance and peak engine efficiency.
• 14.2:1 High Compression: Optimized for racing performance, providing a significant boost in power and torque over stock configurations.
• Pro Series Forged Design: Engineered for extreme durability and reduced weight, allowing for faster revving and increased resistance to thermal stress.
• Advanced Wrist Pin Lubrication: Features enhanced oiling slots and radial boss machining to prevent pin galling at high RPMs.
• Low-Friction Skirt Coating: Permanent skirt treatment minimizes drag and protects the cylinder walls for a longer service life.
• Comprehensive Racing Kit: Includes the high-compression forged piston, performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The 2010-2013 CRF250R is a precision machine that rewards high-quality internal components. Stepping up to a 14.2:1 compression ratio with the Wossner Pro Series will noticeably wake up your engine's mid-to-top end. When installing this kit, ensure your valve train is in top condition and always check your timing chain tension. For best results, use a fresh top-end gasket kit and high-octane racing fuel to fully utilize the increased compression of this Pro Series assembly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2010-2013	Honda	CRF250R

Frequently Asked Questions

Q: Do I need to run race fuel with a 14.2:1 compression piston?
A: With a 14.2:1 ratio, we highly recommend using high-quality 93+ octane pump gas at a minimum, or a 50/50 race gas blend to prevent detonation and ensure peak performance.

Q: What makes the "Pro Series" different from the Standard Series?
A: Wossner Pro Series pistons often feature more aggressive weight reduction and specialized machining for professional racing applications where every gram of reciprocating mass matters for throttle response.

Q: Is this piston compatible with the CRF250X?
A: No, this kit is specifically designed for the CRF250R motocross model (2010-2013). The CRF250X has different engine specifications.

Recommended Pairings

• Complete Top End Gasket Set: Vital for maintaining a proper seal and the correct squish gap for high-compression builds.
• Pro Honda GN4 4-Stroke Oil: High-quality lubrication to keep your CRF250R engine running clean and protected.

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.