S&S Cycle 106 Big Bore Engine Pistons Cylinders Kit Harley Softail Dyna TouringS&S 106” Big Bore Kit. Largest bore we feel can safely be used in a cylinder with a stock spigot O. Bolt-on 9 to 10 cubic inchescylinders do not require crankcase machining to install. Piston weight for 97″ & 106″ kits are the […]