Wossner 8562DA Piston Kit - 2003-2015 Yamaha WR450F / 2003-2004 YZ450F

Wossner 8562DA Premium Series Forged 4-Stroke Piston Kit - Standard Size A

Revitalize the power of your Yamaha 450cc machine with the Wossner 8562DA Piston Kit. Engineered specifically for the iconic 2003-2015 Yamaha WR450F and 2003-2004 YZ450F platforms, this Premium Series forged kit is the professional choice for restoring "Factory Quality" performance. At Moto-House MX, we know these engines are the backbone of serious enduro and motocross riding; Wossner’s aerospace-grade forged components ensure your machine delivers reliable, consistent power in the toughest conditions.

Forged from aerospace-grade aluminum alloy, the 8562DA maintains a robust 12.5:1 compression ratio, providing excellent throttle response and bottom-end torque. Wossner incorporates advanced features like radial boss machining and enhanced oiling slots for superior wrist pin lubrication—essential for these high-displacement, high-heat 4-stroke engines. The permanent skirt coating minimizes internal friction and piston rock, resulting in a quieter engine and a more efficient break-in. This Standard Size A piston (94.96mm) is precision-matched for 95.00mm bores, perfect for an engine refresh that restores your Yamaha to its former glory.

Top Features: Wossner 8562DA Piston Kit

• Standard Size A (94.96mm): Precision-engineered for 95.00mm bores to maintain factory-spec clearances and maximum compression.
• 12.5:1 Compression Ratio: Delivers the perfect balance of increased throttle response and long-term mechanical reliability.
• Premium Series Forging: Significantly stronger and more heat-resistant than OEM cast pistons, ideal for high-load enduro and motocross use.
• Enhanced Lubrication Design: Radial boss machining and annular grooves ensure the wrist pin stays lubricated during sustained high-RPM operation.
• Low-Friction Skirt Coating: Reduces drag and mechanical noise while protecting your cylinder walls from premature wear.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The Yamaha 450 engine is a powerhouse, but keeping the top end fresh is key to longevity. Size A is the ideal choice for a new or excellent-condition cylinder. When performing a rebuild with the 8562DA, we strongly recommend replacing your cam chain and performing a thorough valve check. Using a fresh top-end gasket kit will ensure a professional-grade seal, allowing you to get back to the trail or track with confidence.

Fitment List

Year Range	Vehicle Brand	Vehicle Model
2003-2015	Yamaha	WR450F
2003-2004	Yamaha	YZ450F

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 94.96mm piston designed for the standard 95.00mm bore. It is the ideal choice for cylinders that are still within factory service limits.

Q: Does this kit include the gasket set?
A: No, the kit includes the forged piston, rings, wrist pin, and locks. A complete top-end gasket set is sold separately and is essential for a professional engine rebuild.

Q: Why choose Wossner for my Yamaha 450?
A: Wossner forged pistons are denser and stronger than stock cast parts. They are specifically designed to handle the thermal and mechanical stresses of high-performance racing more effectively, providing superior durability for your 450 engine.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional, leak-free seal and proper engine compression.
• Motorex Cross Power 4T Oil: Premium synthetic lubrication specifically designed for high-performance 4-stroke engines.

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.