Screamin’ Eagle 135CI Stage IV Performance Crate Engine
screamin’ eagle 135 top speed – It is the most powerful, street-compliant engine Harley-Davidson has ever built, producing 144 horsepower and 149 ft-lb of torque. The focus of this engine is on delivering maximum displacement, compression, and flow, with significant increases in horsepower, torque, and overall performance.
For the rider demanding no-compromise performance. This is the most displacement, and the most power, ever created by Harley-Davidson for a street-compliant crate performance engine. Made for riders seeking maximum displacement, compression, and flow, it delivers 144 horsepower and 149 ft-lb of torque to the rear wheel! The 135ci engine compression ratio is 11.6:1. Exclusive 135 and Stage IV badging on the cylinder heads, and timer cover to highlight the powerplant screamin’ eagle 135 top speed.
Key Highlights
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Power & Torque
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130 hp @ 5,500 rpm and 143 lb‑ft torque @ 3,500 rpm at the rear wheel — that’s about +41% horsepower and +28% torque over the Milwaukee‑Eight 117.
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Top-Shelf Components
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68 mm throttle body & CNC-machined intake (race-developed)
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Screamin’ Eagle Extreme CNC-ported heads + performance valve springs
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SE8‑517 high-lift cam, high-performance tappets, billet cam plate & oil pump
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10.7 :1 forged pistons, steel sleeve cylinders (bore 4.31″ × stroke 4.625″), heavier flywheel
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High-capacity 6.8 g/s fuel injectors.
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Installation & Versions
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Bolt-in fit for 2021+ Touring models (Air/Oil‑Cooled or Twin‑Cooled) — no chassis modification required
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Does not fit trikes or California road-legal use; requires ECM tuning via Screamin’ Eagle Pro Street Tuner, and additional parts like head pipe or oil cooler fan
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Price & Warranty
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MSRP ≈ $7,999.95 USD Backed by a two-year warranty if dealer-installed under Custom Coverage
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Racing Roots
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Derived from MotoAmerica “King of the Baggers” racing technology — engineered and assembled at Harley‑Davidson’s Powertrain Operations.
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Is It Right for You?
| Consideration | Details |
|---|---|
| Performance Upgrade | If you’re after maximum street-legal V-Twin power, this is Harley’s most potent crate setup. |
| Installation | Straightforward bolt-in for applicable Touring bikes — just add tuning and required parts. |
| Price | High-end investment, but includes premium internals and factory warranty. |
| Emissions/Legality | 49-state compliant, but not California—ECM tune essential. |
| Supporting Mods | Best performance gains with upgraded intake and exhaust components (sold separately). |
The 135 ci Stage IV crate engine delivers a dramatic leap in performance—130 hp and 143 lb‑ft torque—via race-bred internals and high-flow components, echoing MotoAmerica success on the street Bolt-in simplicity with a dealer-backed warranty makes it a compelling option for riders seeking class-leading power, provided you meet the Touring model and emissions fits.
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