KN93 Series Complete Assembled Knucklehead Engine

Looking for a super-reliable, top-quality, made in the USA engine for your stock or custom motorcycle? You can’t go wrong with an S&S engine! It is a great feeling to crack open the carton on a brand new, ‘vintage’ engine complete with carburetor and ignition, ready to go! Lowbrow Customs is here to answer any questions you may have before or after scoring your new powerplant for that dream bike you are building. If you have any questions please

contact us

and we will get right back to you!

The KN-Series engines are very close in appearance to a stock Harley Knucklehead engine, but offer a number of modern features for more power, better engine life, and improved reliability. Aside from the much larger 93 inch displacement, the main improvement in design is the 1958-1965 style flywheel assembly, which uses a splined sprocket shaft and Timken sprocket shaft bearing. Although this necessitates the use of a 1955-1964 style inner tin primary cover and primary chain sprocket, the increased flywheel stability, strength, and power handling capacity are worth a slight departure from stock.

Rocker arm cover tins are another modern improvement. The lower covers are actually made of 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 and o-ring seal 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 out in order to remove the lower covers.

Instead of the steel brazed-in hard oil return lines used on stock tins, S&S has improved the design of the oil line for better reliability and easier assembly and maintenance.

KN93 offers a standard compression 93 inch engine with authentic generator style crankcases for 1936-1947 Harley-Davidson OHV big twin chassis, completely assembled and ready to run with a preset S&S Super Stock electronic ignition system and Super E carburetor. KN-Series engines come with a one year warranty.

• Natural crankcases and black powder-coated cylinders and heads
• S&S Super Stock single fire ignition system and polished billet timer protect engine with a three-step break-in rev-limiter for first 24-hours of operation
• S&S Super E carb
• Correct length sprocket shaft for 1970-up primary and transmission
• Allows the use of modern primary, transmission, clutch components and electrical system
• Includes oil filter mount at generator location
• 93″ displacement, 8.2:1 compression, 4-1/2″ stroke, 3-5/8″ bore

EMISSIONS NOTES: This engine is

CARB-restricted item

and cannot ship to California or be registered there due to California emissions law.

SHIPPING AND REGISTRATION: Engines will ship to you via freight so lead times may be longer than standard. Engine paperwork(MSO) will be mailed to you separately. Due to the fact each engine is registered to the purchaser there are NO RETURNS on complete engines. Once you purchase an engine we will contact you to confirm all information before completing paperwork and arranging shipping.

Note: There are no returns on carburetors, electrical items, full frames, hardtails or made-to-order items (such as magnetos) unless there is a manufacturer’s defect.