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S&S big bore kits include all the parts you need for a bigger engine displacement leading to a bigger and more reliable engine size. This kit is reliable to use as it has undergone thorough testing before leaving the factory to ensure it can lead to a substantial increase in power. Installing these kits is easy as it only requires swapping of the cylinders and there is no need to split or bore the existing cases. These kits contain pistons, rings, cylinders and gaskets for the base, exhaust and the head. Motorcycle big bore kits are considered to be the most effective and economical way to improve engine performance.