Wossner K8877DA-2 Piston Kit - Polaris RZR 800 Ranger 800 Sportsman 800 Size A

Wossner K8877DA-2 Premium Forged 4-Stroke Piston Kit - Standard Size A

Restore the rugged performance and reliability of your Polaris 800 power plant with the Wossner K8877DA-2 Piston Kit. Specifically designed for the 800cc twin-cylinder engines found in the Polaris RZR, Ranger, and Sportsman, this Standard Size A forged kit is the professional choice for maintaining Factory Quality performance. At Moto-House MX, we know that Polaris owners demand durability for work and play; Wossner’s aerospace-grade forged components provide a significant upgrade over stock cast pistons for your UTV or ATV.

Forged from aerospace-grade aluminum alloy, the K8877DA-2 maintains a steady 10.0:1 compression ratio, ideal for the versatile torque needed in utility and sport applications. This piston features advanced radial boss machining and enhanced oiling slots for superior wrist pin lubrication—a critical feature for long-term engine health in high-duty cycle vehicles. The permanent skirt coating reduces internal friction and piston rock, resulting in a quieter-running engine and a more controlled break-in period.

Top Features: Wossner K8877DA-2 Piston Kit

• Standard Size A (79.93mm Piston): Precision-engineered for the standard 80.00mm bore to restore factory-spec clearances and mechanical efficiency.
• 10.0:1 Compression Ratio: Designed to match original equipment specifications for reliable, consistent power in all conditions.
• Aerospace Forged Alloy: Superior strength and thermal resistance compared to OEM cast pistons, perfect for heavy-duty UTV and ATV use.
• Advanced Lubrication: Radial boss machining and annular grooves ensure consistent oil delivery to the wrist pin under heavy loads.
• Low-Friction Skirt Coating: Permanent coating protects cylinder walls and minimizes mechanical drag for smoother engine operation.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The Polaris 800 engine is a workhorse, but high hours and heavy dust ingestion can take their toll on the top end. When installing the K8877DA-2, always verify your cylinder bore for roundness and ensure your cooling system is functioning perfectly. Because these engines often operate in harsh environments, using a fresh top-end gasket kit and high-quality synthetic oil is essential to ensure your new forged pistons provide years of trouble-free service.

Fitment List

Brand	Models	Year Range
Polaris	RZR 800 / LE / S / EPS / Walker Evans	2008-2014
Polaris	Ranger 800 / EFI / HD / XP / 6x6	2010-2017
Polaris	Sportsman 800 EFI / 6x6 / Big Boss / MV	2005-2014

Frequently Asked Questions

Q: Is this a Standard Size piston?
A: Yes, this is the 79.93mm piston designed for the standard 80.00mm bore. It is the correct choice for cylinders that are still within factory service limits.

Q: Why should I upgrade to a forged piston for my Ranger or RZR?
A: Forged pistons are much stronger than the factory cast pistons. They handle heat and mechanical stress significantly better, which is vital for UTVs that are used for towing, hauling, or high-speed trail riding.

Q: Does this kit include the gaskets?
A: No, the kit includes the forged piston, rings, wrist pin, and locks. A top-end gasket kit is sold separately and is required for a professional, leak-free reassembly.

Recommended Pairings

• Complete Top End Gasket Set: Required for a professional seal and proper compression.
• Heavy-Duty Air Filter: Protect your new investment by ensuring clean air intake in dusty off-road conditions.

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.