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S&S CYCLE 4" Big Bore Bolt-In Sidewinder® Cylinder Kit - 100" - Silver 910-0642 Harley Davidson XL1200C Sportster 1200 Custom Base 2018 KTM 125 Exc 20014" Big Bore Bolt In Sidewinder Cylinder Kit 100" Silver Bolt in no machining, balancing or splitting the crankcases; install can be performed with engine still in frame, Cast Ductile Iron Sleeve in cast aluminum for superior heat transfer, 88" engines are boosted to 100", 96" and 103" engines are boosted 110", 10. 5: 1 compression (w stock 85cc heads) makes for a very streetable and dependable engine that also responds well to performance cams,