Inside the S&S KN93 Knucklehead Engine
As we all know, S&S has made solidly built and trusted V-twin power plants for decades and this Knucklehead is no different. Yes, this engine has all the looks of the famed mills Harley made from 1936 to 1947, but it comes with 93 cubic inches worth of power that is a hell of a lot more cubes than the original 61- and 74ci motors possessed. This S&S KN93 engine is designed with the ’58-65–style flywheel assembly, which uses a stronger splined sprocket shaft and beefier Timken sprocket shaft bearing. Another difference from stock is an improved oil line system as well as innovative rocker arm cover tins, which are another progression from the old H-D hot-air pump. Also the S&S lower rocker covers are built from die-cast aluminum and are kept in place by the valve guides, which now are held down by valve spring pressure sealed with O-rings. This sweet-looking little generator-cased motor comes ready to run with an S&S Super Stock electronic ignition and the extremely reliable S&S Super E carburetor, making it one of the best ways to start your bobber or chopper build.