Wossner 8229D100 Piston Kit - 1985-2001 Honda CR500R +1.00mm

Wossner 8229D100 Premium Forged 2-Stroke Piston Kit - +1.00mm Oversize

Tame the legendary power of the Honda CR500R with the precision of a Wossner 8229D100 Piston Kit. Engineered for the 1985-2001 Honda CR500R, this +1.00mm oversize kit is the definitive choice for riders looking to restore Factory Quality compression and performance to a cylinder that requires a substantial overbore. At Moto-House MX, we provide the heavy-duty forged components required to handle the massive torque and explosive power of the ultimate open-class 2-stroke.

Forged from aerospace-grade aluminum alloy, this piston is built to withstand the extreme mechanical loads of a 500cc single. Unlike cast pistons, Wossner’s forged design offers superior thermal stability and structural strength, which is vital for an engine known for its significant vibration and heat. The permanent skirt coating reduces friction and piston rock, resulting in a quieter engine and smoother operation. Optimized machining keeps the reciprocating mass as low as possible while reinforcing the crown for maximum durability.

Top Features: Wossner 8229D100 Piston Kit

• +1.00mm Oversize (89.92mm Piston): Specifically designed for cylinders bored to 90.00mm to restore performance in heavily worn or damaged sleeves.
• Aerospace Forged Alloy: Maximum structural integrity to handle the extreme cylinder pressures of the Honda 500cc engine.
• Low-Friction Skirt Coating: Permanent coating minimizes wear and noise, essential for the large-bore CR500 piston.
• Single-Ring Performance: Optimized for reduced drag and efficient power delivery across the broad CR500 powerband.
• Complete Kit: Includes everything needed for a top-end refresh: forged piston, ring, wrist pin, and clips.

Expert Pro-Tip: Rebuilding a CR500R requires extreme attention to detail due to its massive displacement. When boring your cylinder for this +1.00mm kit, ensure your machinist has the piston in hand to verify the final hone to exactly 90.00mm. Always inspect your decompression mechanism and exhaust flange for leaks to ensure the engine starts and runs perfectly.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
1985-2001	Honda	CR500R

Frequently Asked Questions

Q: Does this require my cylinder to be bored?
A: Yes, this is a large oversize piston (+1.00mm). Your cylinder must be professionally bored and honed to 90.00mm to accommodate this piston.

Q: Does this kit include the wrist pin bearing?
A: No, the kit includes the piston, ring, pin, and clips. Because of the heavy loads on a CR500 small-end bearing, we strongly recommend purchasing a new high-quality bearing separately.

Q: Why choose a forged piston for a CR500?
A: The CR500 generates significant heat and vibration. A forged piston is much stronger than a cast one, making it far more resistant to fatigue-related failure in such a high-output large-bore engine.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a total seal for your high-compression 500cc rebuild.
• Motorex Cross Power 2T Oil: Premium synthetic protection specifically formulated for high-performance 2-strokes.

Restore your Honda’s legendary power 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.