Athena Big Bore Cylinder Kit For Yamaha Banshee 350 YFZ350 1987-2006 Athena has been constantly investing in cylinder aftermarket replacement parts for more than ten years, to improve their production and performance. All the cylinders are entirely engineered in Italy by Athena s R&D Department which has a strong internal know-how and cutting-edge tools to design and test each piece. They are coated with motor-nicksil, a nickel-silicon coating developed by Athena to obtain smoothness and optimal wear resistance.Athena s cylinder kits and its components are recognized worldwide for their performance, durability and reliability.Athena s Big Bore Cylinder Kits guarantees an increase in performance that can be observed along the power curve, keeping the reliability at the same level of the original components.The kit includes two high-quality aluminum cylinders with increased bore and galvanic coating, cylinder head with two interchangeable central domes, the complete piston with the piston pin and rings, and all the necessary gaskets.All the components of the kit have been developed to withstand the highest temperatures, pressures and stresses and have been validated by Athena technicians with severe bench and road tests. This cylinder kit can be installed without making any changes to the engine crankcase.CAUTION! All Athena products must be used in compliance with the specific national regulations of the member state where it is being marketed or sold. Athena declines all responsibility for any improper use.Description:Sensitive increase in performance without compromising engine reliabilityMaximum durability and smoothness guaranteed by a special nickel and silicon treatment of the barrelCylinder made of a special light aluminum alloyItem Specs:Bore Diameter (mm): 68.00Compression Ratio: 11.9:1Displacement (cc): 392.00Net Weight (Kg): 1.23Brand: AthenaPart Number: P400485100024Fitment:Yamaha Banshee 350 YFZ350 1987-2006Note: Image is for reference only, actual product may vary slightly.