4″ 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; Complete kit includes cylinders, forged pistons, rings, piston pins, clips and gaskets; Not for use with S&S 79cc heads.