Wossner 8324DB - 2022-2026 Beta 300 RR Race Edition Xtrainer Standard Size B

Wossner 8324DB Standard Series Forged 2-Stroke Piston Kit - Standard Size B

Maintain the peak performance of your Italian enduro machine with the Wossner 8324DB Piston Kit. Tailored specifically for the Beta 300cc 2-stroke engine found in the 300 RR, Race Edition, X-Pro, and Xtrainer (2022-2026), the "Size B" piston is the professional's choice for engines that have completed several seasons of riding. At Moto-House MX, we understand that as a 300cc cylinder wears, factory "Size A" clearances can become too loose; this +0.01mm Size B kit provides the precise fitment needed to restore compression and eliminate piston slap in slightly worn bores.

Forged from high-grade aerospace aluminum alloy, the 8324DB is built to withstand the grueling demands of hard enduro and technical trail riding. This kit features a dual-ring design, offering superior secondary compression and improved heat transfer to the cylinder wall, which helps maintain consistent power throughout long, difficult rides. To ensure longevity, Wossner applies a permanent molybdenum disulphide skirt coating that reduces friction and protects the cylinder during high-stress operation. With optimized machining for a perfect strength-to-weight ratio, this 72.96mm piston ensures your Beta retains its legendary lugging ability while gaining the durability of a forged component.

Top Features: Wossner 8324DB Piston Kit

• Standard Size B (72.96mm): Specifically designed for 73.01mm bores, providing a tighter fit for cylinders with slight wear to restore peak performance.
• Dual Ring Configuration: Enhances cylinder sealing and cooling, ensuring consistent torque delivery for demanding off-road racers.
• Aerospace-Grade Forging: Offers superior structural integrity compared to stock cast pistons, significantly reducing the risk of fatigue failure.
• Low-Friction Skirt Coating: Permanent coating reduces internal drag and piston rock for a quieter running engine and longer service life.
• Precision Lightness: Engineered to minimize reciprocating mass, allowing the engine to rev freely and respond instantly to rider input.
• Complete Top-End Kit: Includes the forged Size B piston, performance rings, wrist pin, and circlips.

Expert Pro-Tip: When your Beta 300 has seen significant hours on the trail, the cylinder bore often grows by a fraction of a millimeter. Stepping up to a Wossner Size B (72.96mm) is the standard practice for professional mechanics to bring the piston-to-wall clearance back to ideal specifications without needing a full replate. Always measure your cylinder with a precision bore gauge to confirm that 73.01mm is your current size. For the best results, install with a fresh top-end gasket kit and use premium 2-stroke oil to protect your investment.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2022-2024	Beta	300 RR
2022-2025	Beta	300 RR - Race Edition
2025-2026	Beta	300 RR X-Pro
2022-2025	Beta	300 Xtrainer

Frequently Asked Questions

Q: When should I use a Size B piston instead of Size A?
A: Size B (72.96mm) is used when your cylinder has minor wear. If your standard 73.00mm bore has increased slightly toward 73.01mm, the Size B provides the correct clearance to prevent power loss and excessive piston movement.

Q: Does this kit work for the 2025 Xtrainer?
A: Yes, this kit is compatible with the 300cc Xtrainer models through 2025, as well as the RR and Race Edition models within the specified year range.

Q: Why choose a dual ring piston for the Beta 300?
A: The dual ring setup is ideal for enduro and trail riding, as it provides better sealing at lower RPMs and improves heat dissipation, leading to a longer-lasting top end.

Recommended Pairings

• Complete Top End Gasket Set: Essential for maintaining proper squish clearance and a leak-free seal.
• Motul 800 2T Factory Line: High-performance lubricant to ensure your forged piston remains protected in extreme enduro conditions.

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.