Options available on the kits include a 10.8:1 compression ratio with S&S 91cc high flow Super Stock heads, other choices are flat top pistons, or without heads, a 10.4:1 compression ratio intended for stock 85cc chamber cylinder heads with 10.9cc dished pistons. When replacement cylinder heads are included in a kit they are finished in wrinkle black powder coat to match the factory finish.
S&S originally included chain drive cams in 124ci Hot Set Up kits, but due to continued customer requests for S&S gear drive cams, these are now included and are the Easy Start cams.
Alongside the Hop Up kits, S&S Cycle also has upgraded crank cases available. Created for use on '07-'14 Touring model Big Twins, the cases, made from 356-T6 aircraft grade aluminum, feature thicker wall sections and are clearanced for strokes up to 4 13⁄16in and cams up to .720in lift. A Timken sprocket shaft bearing is included and the front motor mount is reinforced.
The cases are available machined for stock bore, 4 1⁄8in bore, or 4 3⁄8in bore cylinders, and are supplied complete with a Manufacturer's Statement of Origin (MSO) and studs and cam bearings installed.