Wossner 8563DB Piston Kit - Suzuki DR-Z400 LT-Z400 Kawasaki KFX400 Size B

Wossner 8563DB Premium Forged 4-Stroke Piston Kit - Size B

Whether you are carving canyons on a Supermoto, tearing up the trails on a Z400, or commuting on a DR-Z400S, the Wossner 8563DB Piston Kit is the ultimate performance upgrade for your 400cc engine. Specifically engineered for the legendary Suzuki 400 platform (and its variants from Kawasaki and Arctic Cat), this Size B forged kit provides the durability and consistent power delivery required for dual-sport, street, and ATV applications.

Forged from aerospace-grade aluminum alloy, the 8563DB features a 12.2:1 compression ratio, offering a refined power boost over stock components. Wossner incorporates advanced features like radial boss machining and enhanced oiling slots for superior wrist pin lubrication, ensuring your engine handles high-load touring and intense trail riding with ease. The permanent skirt coating minimizes internal friction and piston rock, leading to a quieter engine and a more efficient break-in. This Size B piston (89.95mm) is precision-matched for 90.01mm bores, perfect for an engine refresh that compensates for standard cylinder wear.

Top Features: Wossner 8563DB Piston Kit

• Size B (89.95mm): Precision-engineered for 90.01mm bores, providing the correct piston-to-wall clearance for seasoned cylinders.
• 12.2:1 Compression Ratio: Delivers a perfect balance of increased throttle response and long-term mechanical reliability.
• Aerospace Forged Alloy: Significantly stronger and more heat-resistant than OEM cast pistons, ideal for high-mileage dual-sport use.
• Enhanced Lubrication Design: Radial boss machining and annular grooves ensure the wrist pin stays lubricated during sustained high-speed operation.
• Low-Friction Skirt Coating: Reduces drag and mechanical noise while protecting your cylinder walls.
• Complete Assembly: Kit includes the forged piston, high-performance rings, wrist pin, and pin locks.

Expert Pro-Tip: The DR-Z400/LT-Z400 platform is practically bulletproof, but a piston upgrade is the single best way to revitalize lost power. When installing the 8563DB, we recommend replacing your cam chain and performing a full valve adjustment. Pairing this kit with a fresh top-end gasket set will ensure your engine runs like it did the day it left the factory, whether you're on the street or the dirt.

Fitment List

Brand	Models	Year Range
Suzuki	DR-Z400 / S / E / SM / K | LT-Z400	2000-2023
Kawasaki	KFX400 / KLX400R	2003-2006
Arctic Cat	DVX 400 / TS	2004-2008

Frequently Asked Questions

Q: What is the benefit of Size B over Standard?
A: Size B (89.95mm) is 0.01mm larger than the base size. It is used to restore proper clearance in cylinders that have experienced natural wear, preventing "piston slap" and ensuring maximum compression.

Q: Do I need to run high-octane fuel with this kit?
A: While the 12.2:1 compression is efficient, it performs best on high-quality pump gas. Always ensure your fuel system is clean to maximize the performance of your new forged setup.

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.

Recommended Pairings

• Complete Top End Gasket Set: Ensure a professional, leak-free seal.
• Motorex Cross Power 4T Oil: Premium synthetic lubrication designed for the unique demands of 4-stroke liquid-cooled engines.

Restore your machine’s power and precision today. Buy now at Moto-House MX!

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