Wossner 8056DB Piston Kit - 2001-2006 KTM 125 SX 2-Stroke Size B

Wossner 8056DB Premium Forged 2-Stroke Piston Kit - Size B

When your KTM 125 SX has seen a full season of racing, the Wossner 8056DB Size B Piston Kit is the professional choice for restoring Factory Quality performance. This 53.96mm forged piston is specifically engineered for cylinders that have experienced natural wear, ensuring the precise piston-to-wall clearance required for maximum 2-stroke power. At Moto-House MX, we provide the technical components champions rely on to keep their high-revving 125cc machines at the head of the pack.

Forged from aerospace-grade aluminum alloy, this piston offers a superior strength-to-weight ratio, allowing it to withstand the extreme RPMs of competitive 125cc racing. The permanent skirt coating is a vital feature, reducing internal friction and piston rock for a quieter engine and smoother power delivery. The single-ring design of the 8056DB is optimized for reduced drag and high-RPM efficiency, ensuring your KTM stays crisp and responsive on every gate drop.

Top Features: Wossner 8056DB Piston Kit

• Standard Size B (53.96mm): Precision-sized for cylinders with a 54.01mm bore to maintain optimal mechanical clearances.
• Aerospace Forged Alloy: Premium aluminum construction for maximum heat resistance and high-RPM durability.
• Low-Friction Skirt Coating: Permanent coating reduces wear and mechanical noise for a more efficient engine.
• Single-Ring Racing Design: Engineered for reduced friction and maximum performance in 125cc competition.
• Complete Kit: Includes everything needed for a top-end refresh: forged piston, ring, wrist pin, and clips.

Expert Pro-Tip: 125cc engines are highly sensitive to piston clearance. Use a micrometer to verify your cylinder bore. If your cylinder has worn slightly beyond the "A" spec, the Size B piston will restore the tight seal needed to prevent power loss and piston slap.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2001-2006	KTM	125 SX

Frequently Asked Questions

Q: What is the benefit of a Size B piston?
A: Size B is 0.01mm larger than Size A. It is used in cylinders that are broken in or have very slight wear to ensure the piston-to-wall clearance remains within factory specifications for maximum compression.

Q: Does this kit include the wrist pin bearing?
A: No, the kit includes the piston, ring, wrist pin, and clips. We highly recommend purchasing a new small-end bearing separately during every top-end rebuild.

Q: Is this a single or dual ring piston?
A: This is a single-ring design, which is preferred for 125cc racing to reduce friction and allow the engine to rev more freely.

Recommended Pairings

• Top End Gasket Kit: Ensure a leak-free seal for your KTM 125 rebuild.
• Motorex Cross Power 2T Oil: The ultimate protection for high-performance 2-stroke pistons.

Restore your KTM’s racing punch 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.