NA-40015-6K Top End Kit 72.45/+1.50 11:1 Yam
NA-40015-6K Top End Kit 72.45/+1.50 11:1 Yam
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NA-40015-6K Top End Kit 72.45/+1.50 11:1 Yam
Unlock the full potential of your engine with the NA-40015-6K Top End Kit. This high-performance kit is designed to enhance the efficiency and power of your Yamaha, making it the perfect upgrade for serious riders and racers alike.
Key Features:
- Complete Top End Kit: Includes everything you need for a successful rebuild - piston, rings, wrist pin, clips, top end bearing, and a comprehensive gasket kit.
- MOS2 (Teflon/Molybdenum) Coated Skirts: Our advanced coating process offers a bond that is 10 times stronger than traditional spray coatings, delivering superior heat transfer and reduced friction, while helping to eliminate cold seizures.
- Machined Smooth Heads: Specifically designed to reflect combustion heat and minimize carbon buildup, these heads can enhance horsepower and fuel economy by up to 6%.
- Anodized Domes: These pistons are 75% stronger than non-anodized options, providing exceptional heat resistance and durability for long-lasting performance.
- Hypereutectic Casting Process: With higher silicon content, this technology reduces expansion rates, enhances wear resistance, and allows for withstanding higher cylinder temperatures.
Benefits:
- Experience improved engine performance and efficiency.
- Reduced maintenance costs and extended engine life.
- Enhanced overall riding experience with increased power output.
Use Cases:
- Perfect for competitive racing environments where performance is crucial.
- Ideal for motorcycle enthusiasts looking to upgrade their engine components.
- Great for restoration projects aiming for improved reliability and power.
Transform your Yamaha engine into a powerhouse with the NA-40015-6K Top End Kit. Whether you’re hitting the track or cruising on the open road, this kit ensures you’re equipped for the ultimate riding experience.
Shipping & Returns
Shipping & Returns
📦 Shipping:
Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days, depending on your location.
↩️ Returns:
You may return or exchange products within 60 days of receiving your order. Items must be in original condition with proof of purchase. If your item is defective or damaged due to manufacturing issues, we’ll replace it at no additional cost.

