Description
NA-80005-4K Top End Kit Twin Cylinder 91.958/+1.00 Can
Upgrade your engine’s performance with the NA-80005-4K Top End Kit, specifically designed for twin-cylinder engines. This comprehensive kit includes all the essential components you need for a successful top-end rebuild, ensuring your engine runs smoothly and efficiently.
Key Features:
- Complete Top End Kit: Each kit comes with a piston, rings, wrist pin, clips, top end bearing, and a gasket kit, providing everything you need for a full overhaul.
- MOS2 (Teflon/Molybdenum) Coated Skirts: Our unique rolled-on application process creates a bond that is 10 times stronger than traditional spray-on coatings. This results in improved heat transfer, reduced friction, and minimizes the risk of cold seizures.
- Machined Smooth Heads: These heads reflect combustion heat while reducing carbon buildup, which not only protects the piston but can also enhance horsepower and fuel economy by as much as 6%.
- Anodized Domes: The anodized finish increases heat resistance and durability, making our pistons 75% stronger than their non-anodized counterparts.
- Hypereutectic Casting Process: This advanced casting method increases silicon content for lower expansion rates and superior wear resistance, allowing components to withstand higher cylinder temperatures.
Why Choose the NA-80005-4K Top End Kit?
This top-end kit is engineered for performance, longevity, and efficiency, making it an ideal choice for enthusiasts and everyday riders alike. Experience the difference in power and reliability with our meticulously designed components that enhance your engine’s capabilities.






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