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S&S KN-Series Engines

Knucklehead - the name describes a true legend and this engine design is without a doubt one of the important milestones in the history of Harley-Davidson. Introduced in the year 1936 the ohv-engined models in short time became synonyms for sporting, fast and reliable touring machines. Economically this layout proved to be a huge success for the Motor Company, too, because brand followers - and many others - quickly realized the outstanding qualities of this motorcycle. Design and technology of the Knucklehead turned out to be supremely sound and it became the prototype of all Milwaukee Big Twins, which significantly influenced all successive model groups down to the present day. The KN-Series engines by S&S closely resemble the appearance of a stock Knucklehead engine. However, numerous reforms enhance power, engine life, and reliability. The main improvement in design is the 1958-65 style flywheel assembly, which uses a splined sprocket shaft and a Timken sprocket shaft bearing on the drive side. This increased flywheel stability and strenght became necessary to handle the significantly increased power development. The rocker arm cover “tins” are another modern improvement. They are made from die-cast aluminum, and instead of being held in place by the valve guide, they are held down by valve spring pressure. A special gasket on the bottom of the lower “tin” provides a positive seal, and is much easier to service if needed, since the valve guides do not have to be pressed.

The selection includes 74” (1200 cc) and 93” (1560 cc) engines with crankcases for early style chassis thru 1947, with 1955-64 tin primary and 1936-64 transmissions.

S&S KN-Series engines come completely assembled and ready to run with a electronic S&S Super Stock ignition system and Super E carburetor.

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S&S Engines

Ask American V-Twin enthusiasts to name one manufacturer of high performance engines, and nine times out of ten they‘ll say S&S! And you gotta‘ wonder about the one guy who didn’t. S&S is the largest manufacturer of engines for the V-Twin high performance aftermarket. S&S engines power more custom V-Twins than anyone else‘s, and they have always been popular as a high performance upgrade in stock motorcycles. What could be simpler? Take your old engine out, and put a new S&S engine in. It’s just that simple, and you have a sleeper hog that will run the wheels off the competition. The reason that S&S engines are so popular can be summed up in two words: „Proven Performance“.

Everybody knows that S&S engines make a lot of power. What you may not be aware of is that because of our innovative designs and premium materials, they last a lot longer than you might think was possible for a high performance engine. Let‘s face it, the stroker engines of the late 1960‘s and early 1970‘s were pretty crude by today’s standards, and they gave high performance motors a bad reputation as far as engine life is concerned. But keep in mind that the high performance industry has come a long way in the last 50 years or so, and S&S has been a leader in the quest not only for more power, but also for greater dependability and improved engine life. So if you could double your horsepower and still get near stock engine life, wouldn’t that be a fair trade off? Judging from the number of large displacement S&S engines on the street, the answer seems to be „Yes!“.

Buying an assembled engine from S&S is the surest way to get S&S quality from start to finish. S&S parts and S&S expert assembly! But how do you know for sure that the engine you have was really assembled by S&S, and how do you know that all the parts in it are S&S? The answer is simple. All complete engines assembled by S&S in Viola, WI, USA come with a certificate of authenticity that lets you and your customer know that they have the real deal. Buyer beware of any engine that does not come with a certificate of authenticity!

Spare parts:

  • 12-001

    12-001 Spark plug by Autolite; fits Shovelhead 1975→, Evo Big Twin 1984→; also for: ...

Accessories:

  • 12-027

    12-027 Spark plug by Champion; fits Shovelhead 1975→, Evo Big Twin 1984→; also for: ...

  • 12-086

    12-086 Spark plug »OEM«; fits Shovelhead 1975→, Evo Big Twin 1984→; also for: S&S ...