Wossner 8017DB Piston Kit - 1996-2003 KTM 300 EXC MXC EGS 2-Stroke Size B

Wossner 8017DB Premium Forged 2-Stroke Piston Kit - Size B

When your KTM 300 engine has seen plenty of hours on the trail and the cylinder has naturally worn, the Wossner 8017DB Size B Piston Kit provides the precise fitment needed to restore Factory Quality compression. Specifically designed for cylinders that have slightly expanded beyond the original "A" sizing, this 71.94mm forged piston ensures a tight seal and quiet operation. At Moto-House MX, we provide the technical components necessary to keep your legendary 2-stroke engine running with maximum efficiency.

Forged from high-grade aerospace aluminum alloy, this piston is engineered for superior strength and lightness. The permanent skirt coating is a standout feature, reducing internal friction and piston rock, which is critical for extending the life of your top-end. Whether you are navigating technical single-track or high-speed desert sections, the dual-ring design of the 8017DB offers consistent power delivery and exceptional oil control for your 293cc KTM powerplant.

Top Features: Wossner 8017DB Piston Kit

• Standard Size B (71.94mm): Optimized for cylinders with a 72.01mm bore to maintain perfect clearances.
• Aerospace Forged Aluminum: High-strength construction that resists heat and stress better than cast alternatives.
• Permanent Skirt Coating: Minimizes friction and wear for a quieter engine and faster break-in.
• Dual-Ring Design: Provides a superior combustion seal and consistent compression for 2-stroke performance.
• Complete Kit: Includes everything needed for the rebuild: forged piston, high-quality rings, wrist pin, and clips.

Expert Pro-Tip: Use a micrometer to measure your cylinder bore accurately. If your cylinder has slight wear but is still within spec, the "B" size piston is the professional choice to eliminate "piston slap" and restore lost power.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
1996-2003	KTM	300 EXC
1996-2003	KTM	300 MXC
1996-2003	KTM	300 EGS
1998-2003	KTM	300 EXC Six Days

Frequently Asked Questions

Q: What is the difference between Size A and Size B?
A: Size B is 0.01mm larger than Size A. It is used in cylinders that have been broken in or have very slight wear to ensure the piston-to-wall clearance remains within factory specifications.

Q: Does this kit fit the KTM 250?
A: No, this kit is specifically sized for 300cc models (293cc displacement) with a 72mm nominal bore.

Q: Do I need to re-plate my cylinder to use this?
A: As long as your Nikasil plating is in good condition and simply worn within the "B" spec (72.01mm), you can install this piston without re-plating.

Recommended Pairings

• Cometic Top End Gasket Kit: Complete your 2-stroke top-end service with a reliable seal.
• Motorex Cross Power 2T: The ultimate synthetic oil to protect your new forged piston.

Restore your KTM’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.