Wossner 8937DA Piston Kit - 2017-2026 Honda CRF450R CRF450RX CRF450RWE Size A

Wossner 8937DA Pro Series Forged 4-Stroke Piston Kit - Standard Size A

Unlock the elite racing potential of your Honda 450cc engine with the Wossner 8937DA Piston Kit. Designed for the 2017-2026 Honda CRF450R, RX, and Works Edition (RWE), this Pro Series forged kit is the ultimate choice for riders seeking a significant bump in performance while maintaining "Factory Quality" reliability. At Moto-House MX, we specialize in high-performance builds, and the Wossner Pro Series stands out as a top-tier upgrade for the modern Honda Unicam engine.

Forged from aerospace-grade aluminum alloy, the 8937DA pushes performance boundaries with a high-compression 14.0:1 ratio. This increase in compression delivers explosive throttle response and massive gains in low-to-mid range torque, perfect for clearing jumps and pulling holeshots. This piston includes advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—vital for the extreme thermal loads of a high-compression race engine. The permanent skirt coating reduces internal friction and piston rock, resulting in a quieter engine and a more controlled break-in period. This Standard Size A piston (95.95mm) is precision-matched for 96.00mm bores, restoring your machine to its original race-winning tolerances with added power.

Top Features: Wossner 8937DA Piston Kit

• Standard Size A (95.95mm Piston): Precision-matched for 96.00mm bores to maintain tight factory clearances and maximum mechanical efficiency.
• High-Compression 14.0:1 Ratio: Engineered for serious racers looking for increased torque and faster engine acceleration.
• Pro Series Forging: Denser and more heat-resistant than OEM cast pistons, featuring a double-bridged design where noted for maximum structural integrity.
• Advanced Lubrication Design: Radial boss machining and annular grooves ensure the wrist pin stays lubricated during sustained high-RPM operation.
• Low-Friction Skirt Coating: Minimizes drag and protects cylinder walls, ensuring your engine runs cooler and lasts longer.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The 8937DA is a high-compression Pro Series piston. When jumping to a 14.0:1 ratio, we recommend using high-quality race fuel or the highest octane pump gas available to prevent detonation. During installation, always verify your squish clearance and inspect your valve train. Because this is a high-performance part, pairing it with a fresh top-end gasket kit and premium synthetic oil is essential to ensure your Honda performs at its peak for every moto.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2017-2026	Honda	CRF450R / CRF450RX
2019-2026	Honda	CRF450RWE (Works Edition)
2022-2024	Honda	CRF450R-S

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 95.95mm piston designed for the standard 96.00mm bore. It is the correct choice for cylinders that are new, freshly replated, or within factory service limits.

Q: What fuel should I use with 14.0:1 compression?
A: While high-quality 93 octane pump gas may work in some conditions, for maximum safety and performance, we recommend using a 50/50 race gas blend or full race fuel to prevent engine knock and ensure clean combustion.

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, leak-free reassembly.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional seal for your high-compression engine.
• Motorex Cross Power 4T Oil: The ultimate synthetic lubrication 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.