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S&S Cycle cylinders are easy to assemble kits for those who want to improve the performance of their engine. These are great cylinders that fit easily on your engine and will help rebuild the top end for better bike performance. They are made to be strong and durable, reducing damages that may be caused through rough handling and the intense power produced by high performance engines. These are custom made motorcycle cylinders and they will therefore use the stock chain drive system. Another advantage of custom made products is that they make installation easy and quick.