02 The flywheel assembly comes fully assembled, dynamically balanced, and trued. Unlike the 1.671-inch crankpin found in H-D’s 88ci engines, S&S uses a smaller 1-1/2-inch-diameter crankpin. According to S&S, a smaller crankpin allows for the use of replaceable bearing races in the lower end of the rods. The smaller crankpin also equates to less weight while providing more clearance when stepping up to larger flywheel stroke. Through its experience with nitro drag race engines, S&S has found that the smaller crankpin is more than capable of handling the stresses associated with high-performance engines.
03 These are the cylinders and pistons that come with S&S’s 106ci Big Bore kit ($749.95) that will be used with the flywheel assembly. S&S offers these kits for 88ci and 96ci engines. With no crankcase boring required, owners of 88ci bikes can bump up to 97ci, while those that have the 96ci engines can step up to 106ci just by swapping their stock setup for these cylinders and pistons. The cylinders feature a high-strength liner material, and with a 3.97-inch bore, this is the largest diameter S&S is willing to go with these cylinders and still feel confident about their longevity and durability. While the OE cylinders can be bored to this same diameter, S&S isn’t sure the stock liner and spigot material is strong enough to hold up. The cylinders are available in silver or black powdercoat to match OE engine finishes.
04 The 3.927-inch forged coated pistons are flat top pistons that feature enlarged valve pocket recesses for oversize valves and higher lift cams, like the 585s that will be installed.
05 S&S recently came out with its new Stealth Air Cleaner which features a high-flow air filter combined with an air directional stinger cone over the top of the filter that directs air flow to the center of the radiused inlet of the back plate. The design helps streamline air directly into the carb/throttle body. You can use the traditional S&S teardrop air cleaner cover or S&S offers several other covers like the new AirStream cover, which is similar to the teardrop but features meshed vents. S&S offers the Stealth Air Cleaner and Air Stream cover as kits ($265.95) in either jet black or chrome.
06 Here’s the throttle body kit ($824), manifold ($134.95), Quickee Pushrod kit ($224.95) hydraulic tappets ($259.95), and Easy Start 585 cam kit ($367.95) Oscar got for his bike.
07 This 58mm throttle body combined with the Stealth/AirStream Air Cleaner kit should provide plenty of air to generate good power. Sold as a complete kit, the throttle body comes with larger fuel injectors, a fuel rail, harness adapters, and all necessary hardware, gaskets, and hoses.
08 Introduced a few years back, the Easy Start cams feature a spring-loaded compression release built into the heel of the exhaust cam lobes at the point where the valve would normally be fully closed. The raised lobe of the compression release holds the exhaust valve slightly open at cranking speed, which releases some of the compression making it easier to turn the engine over and relieves stress on the battery and starter. According to S&S the 585s are designed for larger displacement engines to deliver strong horsepower and torque through the 2,500-5,500-rpm range.
09 When we caught up with Kevin he had already taken the primary off, unbolted the engine case from the transmission, and was pulling the case out of the frame.
10 With the lower end on a work bench, Kevin removed all the case bolts, then bolted a JIMS crank assembly removal tool to the left case half.
11 As he turned the center screw of the removal tool the case slowly separated.
12 He was then able to remove the left case half exposing the left side of the flywheel.