Wossner K8978DA-3 Piston Kit - 2016-2025 Yamaha YXZ1000R 4-Stroke Forged

Wossner K8978DA-3 Premium Forged 4-Stroke Piston Kit

Reinforce your Yamaha YXZ1000R for ultimate reliability and power with the Wossner K8978DA-3 Piston Kit. Specifically engineered for the 2016-2025 Yamaha YXZ1000R, this forged kit is designed to provide the structural integrity required for high-performance UTV applications. At Moto-House MX, we know that the YXZ's triple-cylinder engine demands precision-engineered components to handle aggressive off-road driving and high sustained RPMs.

Forged from high-silicon aerospace-grade aluminum alloy, these pistons feature Wossner’s advanced engineering, including enhanced piston pin oiling slots, radial boss machining, and annular grooves to ensure superior wrist pin lubrication. With a 9.5:1 compression ratio, this kit is an excellent choice for riders looking for a durable setup that is well-suited for forced induction or turbo applications where lower compression is required to manage cylinder pressures safely. The skirt coating reduces internal friction for a quieter engine and a more efficient break-in period.

Top Features: Wossner K8978DA-3 Piston Kit

• Standard Size A (79.95mm Piston): Precision-engineered for the standard 80.00mm bore, maintaining tight tolerances for a quieter running engine.
• Aerospace Forged Alloy: High-strength aluminum construction built to withstand the rigors of high-performance UTV racing.
• 9.5:1 Compression Ratio: Ideal for turbo or forced induction builds, providing a safer margin for high-boost applications.
• Advanced Lubrication: Radial boss machining and enhanced oiling slots provide critical lubrication to the wrist pin.
• Skirt Coating & Ring Land Treatment: Reduces friction and improves ring seal for better oil control and longevity.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The Yamaha YXZ1000R is a high-revving 3-cylinder machine. For a complete and balanced engine refresh, it is highly recommended to replace all three pistons at once. Because this is a 9.5:1 compression piston, it is a favorite for those adding a turbocharger, as it allows for more boost pressure compared to the high-compression factory pistons.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Type
2016-2025	Yamaha	YXZ1000R / SS / SE (UTV)

Frequently Asked Questions

Q: Is this kit for one piston or all three?
A: This part number represents one (1) piston kit. For a complete YXZ1000R engine rebuild, you will need to purchase three (3) kits.

Q: Why would I choose 9.5:1 compression over 13.0:1?
A: The 9.5:1 ratio is lower than stock, which is specifically designed for engines running turbochargers or superchargers. It helps prevent detonation under high boost levels.

Q: Does this include the piston rings?
A: Yes, every Wossner kit comes complete with the forged piston, a high-quality ring set, wrist pin, and circlocks.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a leak-free seal for your YXZ triple-cylinder rebuild.
• High-Performance Synthetic Oil: Protect your new forged pistons with oil designed for high-RPM 4-stroke UTV engines.

Build your Yamaha for boost 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.