Motorcycle enthusiasts often seek to enhance performance by replacing their existing engines with more powerful alternatives. While motorcycle engine swaps aren't as common as LS engine swaps for cars, Harley-Davidson's range of crate engines offers an accessible upgrade path, especially if you have the right tools and skills for a DIY project.
Harley-Davidson’s website features 14 different Screamin' Eagle crate engines. Prices start at $7,299.95 for the 131-cubic-inch engines, with the 135-ci variant priced at $7,999.95. Although these engines are not as affordable as some entry-level motorcycles like the Kawasaki Ninja 400, they are touted as Harley’s most powerful options, which contributes to their high price tag.
Engine swaps are typically performed by enthusiasts aiming for greater performance. Harley's selection, while extensive, mainly varies in appearance and cooling methods rather than performance metrics. Despite the high cost, installing a Screamin' Eagle engine can significantly boost torque and horsepower over stock engines. Positive user reviews on Harley’s website reflect satisfaction with these engines.
Do note, however, that an ECU calibration is required post-installation, adding around $500 to the total cost. While you can perform the swap yourself, having a dealer handle the installation might offer additional benefits, such as integrating the new engine into your motorcycle’s factory warranty if done within 60 days of purchase. For those upgrading older bikes, a home installation is feasible if you're confident in your abilities.