WOSSNER K8897D300-2 2011-2014 Polaris RZR XP 900 Big Bore Forged Piston Kit +3.00mm

Maximum Displacement for Your Polaris RZR XP 900

Push your RZR beyond factory limits with the WOSSNER K8897D300-2 Big Bore Piston Kit. This +3.00mm oversize (96mm bore) forged twin-piston set is the ultimate performance upgrade for Polaris RZR XP 900 owners looking to recover damaged cylinders or simply gain a significant boost in displacement and torque. Forged from aerospace-grade aluminum, these pistons are engineered to handle the increased loads of a big-bore setup, offering far superior durability over stock cast pistons. Get your Pro Series power upgrade today from Moto-House MX and dominate the trails with confidence.

The technical engineering of the K8897D300-2 is optimized for high-output UTV applications. Each piston features enhanced pin oiling slots and radial boss machining to maintain critical lubrication of the wrist pins during high-stress operation. To ensure a quieter engine and smoother break-in, the skirts are treated with a permanent anti-friction coating. The 11.0:1 compression ratio provides a perfect balance of explosive power and long-term engine reliability. This complete twin-cylinder kit includes two forged pistons, high-performance rings, wrist pins, and pin locks for a comprehensive professional rebuild.

Top Features: WOSSNER K8897D300-2 Big Bore Kit

• +3.00mm Big Bore (96mm): Significantly increases engine displacement for improved low-end torque and overall horsepower.
• Pro Series Forged Design: Aerospace-grade alloy construction provides maximum strength for high-performance 4-stroke use.
• Enhanced Lubrication System: Annular grooves and radial boss machining ensure constant oil flow to the wrist pins.
• Anti-Friction Skirt Treatment: Reduces internal drag and engine noise while protecting the cylinder walls during break-in.
• Complete Twin Set: Includes two matched pistons and all necessary hardware for a full parallel-twin engine overhaul.

Expert Pro-Tip

When jumping to a +3.00mm (96mm) bore, cylinder wall thickness and cooling are critical. Ensure your cylinders are professionally bored and plate-honed to Wossner's exact clearances, and consider an upgraded cooling system to manage the extra heat generated by the larger displacement.

Fitment List

Year Range	Vehicle Brand	Vehicle Model & Size
2011-2014	Polaris	RZR XP 900 EFI / LE / EPS / 4x4
2012-2013	Polaris	RZR 4 XP 900 EFI / EPS / 4x4

Frequently Asked Questions

Q: Does this kit require cylinder boring?
A: Yes, this is a +3.00mm oversize kit. Your cylinders must be bored and honed to 96.00mm to accommodate these larger pistons.

Q: Is this kit compatible with standard 91 octane fuel?
A: Yes, the 11.0:1 compression ratio is specifically designed to deliver high performance while remaining safe for use with premium pump gas.

Q: Are the wrist pins included in this kit?
A: Yes, every Wossner kit at Moto-House MX includes the pistons, rings, wrist pins, and circlips.

Recommended Pairings: Big Bore Top-End Gasket Set, Heavy Duty Cam Chain, and High-Performance 4-Stroke Synthetic Oil.

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