Wossner 8082DB Piston Kit - 2003-2004 KTM 250 SX Standard Size B

Wossner 8082DB Standard Series Forged 2-Stroke Piston Kit - Standard Size B

Reclaim the aggressive power of your KTM with the Wossner 8082DB Piston Kit, precision-designed for the 2003-2004 KTM 250 SX. This "Size B" forged kit is the professional solution for riders performing a top-end refresh on cylinders that have seen moderate track time. At Moto-House MX, we know that maintaining the correct piston-to-wall clearance is vital for 250cc 2-strokes to prevent power loss; Wossner’s aerospace-grade forging ensures your KTM remains reliable while delivering the crisp, hard-hitting powerband the SX series is famous for.

Forged from high-performance aluminum alloy, the 8082DB features a single-ring configuration. This setup is highly favored by racers to reduce internal friction, allowing the engine to rev more freely and respond instantly to throttle input. To ensure maximum service life and a quiet engine, Wossner applies a permanent molybdenum disulphide skirt coating that reduces friction and prevents piston rock within the cylinder. Precision-machined for 66.41mm bores, this 66.35mm piston kit provides the exact tolerances needed to restore factory-level performance.

Top Features: Wossner 8082DB Piston Kit

• Standard Size B (66.35mm): Engineered specifically for 66.41mm bores to compensate for minor cylinder wear and restore peak compression.
• Single Ring Configuration: Minimizes drag against the cylinder wall for faster engine acceleration and improved top-end over-rev.
• Aerospace-Grade Forging: Significantly more durable and resistant to thermal fatigue than OEM cast pistons, providing peace of mind during high-intensity racing.
• Low-Friction Skirt Coating: Permanent skirt treatment ensures a smoother break-in period and protects the cylinder wall from premature wear.
• Optimized Machining: Expertly crafted to balance extreme lightness with structural strength in critical areas like the crown and skirt walls.
• Complete Assembly: Includes the high-performance forged Size B piston, single ring, wrist pin, and circlips.

Expert Pro-Tip: The 2003-2004 KTM 250 SX is a powerhouse, but its performance depends entirely on a perfect top-end seal. If your cylinder has some hours on it but is still within healthy limits, the Size B (66.35mm) is the standard professional choice to bring your clearances back to specification. Always use a precision bore gauge to confirm your cylinder measures 66.41mm before installation. For a professional-grade rebuild, always install with a fresh top-end gasket kit and utilize premium synthetic 2-stroke oil to protect your forged assembly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2003-2004	KTM	250 SX

Frequently Asked Questions

Q: When should I choose Size B instead of Size A?
A: Size B (66.35mm) is 0.01mm larger than Size A. It is used when the cylinder has experienced a small amount of natural wear, allowing you to maintain the tight tolerances necessary for maximum horsepower and to prevent piston slap.

Q: What are the benefits of a single ring piston?
A: A single ring creates less friction than a dual-ring setup, which typically results in a snappier throttle response and higher RPM potential, making it ideal for motocross applications.

Q: Does this kit include the wrist pin bearing?
A: Piston kits include the piston, rings, pin, and clips. While the wrist pin is included, the small-end needle bearing is sold separately. We always recommend replacing the bearing during every piston change.

Recommended Pairings

• Complete Top End Gasket Set: Essential for maintaining a perfect seal and correct squish heights on your KTM 250 SX.
• Motul 800 2T Factory Line: High-performance lubricant to ensure your new forged piston stays protected at high RPMs.

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.