This street-tuned 120 cubic inch Screamin’ Eagle® Crate Motor takes your bagger from mild to wild. This engine is designed for bolt-in installation in the Original Equipment-style chassis of your Touring bike. The crankcase, cylinders and heads are painted black, and feature machined aluminum highlights and chrome covers for a stunning “show-and-go” look.

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Why Should I Consider a Screamin' Eagle® SE120ST Street Performance Crate Motor?

It's the largest engine displacement Harley-Davidson® has ever offered for Twin Cam models. Now street compliant in North America and backed by a full 1-year factory warranty. For owners looking for extreme performance and the bragging rights that go with it, this engine is for you. 

The motor is designed for bolt-in installation on the Original Equipment-style chassis of Touring motorcycles and comes equipped with the large bore 58mm throttle body—that’s 18% larger than the O.E. throttle body.

 *Developed and tested in Milwaukee

What does the Screamin' Eagle® SE120ST Street Performance Crate Motor include?

  • 4.060 big-bore cylinders
  • 4-5/8" stroke SE Pro stroker flywheel and rod assembly
  • 10.5:1 high-compression nickel-plated forged pistons with Teflon® coated skirt
  • Titanium SST piston rings
  • SE-259E high-lift cams
  • Perfect-Fit pushrods
  • SE high-performance lifters
  • CNC-ported MVA heads with automatic compression release
  • Screamin’ Eagle Pro High-Flow 58mm EFI Throttle Body, high flow injectors and manifold clamps
  • Machined lower rocker boxes for valve spring collar clearance
  • Factory-machined engine cases
  • Screamin’ Eagle inner crankcase full complement cam needle bearings
  • SE Lefty high-performance crankcase output bearing and nitride bearing race
  • SE Performance spark plugs
  • 120ST cam cover and cylinder head medallions

Are Upgrades Available?

Yes! For best performance results, we recommend combining this engine with your choice of:

  • Heavy Breather High-Flow Air Cleaner P/N 29253-08B (Chrome), P/N 29006-09B (Black)
  • High Performance Exhaust System P/N 64800022

* Sold Separately

What Else do I Need to Know?

  • Fits 50-state ’10-later Touring models. Does not fit Twin-Cooled™ models. '10 Touring models require Screamin' Eagle Big Twin Compensator Kit P/N 40100061.
  • All EFI-equipped models require ECM calibration, ready upon install - does not require tuning on your Dyno equipment.
  • The ST in the SE120ST stands for “Street-Tuned”, noting that it is a street compliant engine.
  • This engine is street-legal when used with Original Equipment mufflers or the Screamin’ Eagle Street Performance Exhaust System P/N 64800022. All EFI-equipped models require ECM calibration* (priced separately). U.S. delivered engines include Manufacturers Statement of Origin (MSO).

*Recalibration is required for proper installation, See Dealer for details. Labor cost not included.

What Other Options do I Have?

Harley-Davidson also offers Complete Crate Engines and Short Block Assemblies, in various displacements, straight off the factory line. See your Dealer for details.

Fast & Easy

This all-new engine features bolt-in installation. And with as little as two weeks lead time, you can have your engine straight off the factory floor and intstalled on your bike in time for riding season. See your Dealer for additional details and to order.