S&S Cycle 93 Inch KN93 Knucklehead Engine for 1936-1999 Harley-Davidson Big Twin

S&S Cycle 93 Inch KN93 Knucklehead Engine for 1936-1999 Harley-Davidson Big Twin

The S&S Cycle KN93 captures the unmistakable look and feel of Harley-Davidson’s golden age while delivering the dependability and performance that vintage engines never could. Whether restoring an original chassis or building a custom from scratch, this engine transforms any project into something that runs every bit as well as it looks.

Key Features

• Completely assembled and ready to run with no additional component sourcing needed
• Authentic knucklehead appearance with modern engineering throughout
• Factory-preset S&S Super Stock single-fire electronic ignition for reliable starting
• S&S Super E carburetor with Stealth Air Cleaner included
• Die-cast aluminum lower rocker arm covers replace original steel covers for easier service
• Improved oil return line design for long-term reliability over the stock design
• Available in generator style for pre-1948 chassis and alternator/generator style for 1970-1999 builds
• 1958-1965 style flywheel assembly with splined sprocket shaft and Timken bearing for enhanced stability

Technical Specifications

• Displacement: 93 cubic inches
• Bore: 3-5/8″
• Stroke: 4-1/2″
• Compression: 8.2:1 standard compression
• Ignition: S&S Super Stock single-fire electronic
• Carburetor: S&S Super E with Stealth Air Cleaner
• Finish: Natural crankcases, black powder-coated cylinders and heads
• Warranty: 1 year

Fitment Notes

• Generator style fits 1936-1947 H-D OHV Big Twin chassis; also fits 1948-1965 with included front motor mount spacer
• Alternator/generator style fits 1970-1999 H-D Big Twin custom chassis with modern primary components
• Requires 1955-1964 style inner tin primary cover and primary chain sprocket on both configurations due to the 1958-1965 style flywheel assembly
• NOT LEGAL FOR SALE OR USE IN CALIFORNIA on any pollution-controlled motor vehicle; not legal on any EPA pollution-controlled motor vehicle
• Review the Fitment tab for complete year and model breakdown