Screamin Eagle Katalog 2023

8 SCREAMIN’ EAGLE ®
Milwaukee-Eight® Stage Upgrades
MILWAUKEE-EIGHT ® POWERTRAIN
Screamin’ Eagle ® Stage upgrades offer complete street-compliant performance configurations
engineered to generate specific torque and horsepower gains. Eliminating all the guesswork and
trial-and-error testing normally associated with engine modifications, Stage upgrades include
everything you need to enhance your bike’s performance. Start with the foundation, the Stage I
upgrade, then choose from Stage ll, lll or lV depending on your performance goals, budget
and riding style.
STAGE II
STAGE I + CAM UPGRADE
Adding performance cams to a Stage I equipped bike is the next step to improved
performance. Cam choices allow you to tailor the engine’s performance to your specific
needs. A torque cam offers on-demand throttle response from low- to mid-RPM at
cruising speed. A power cam targets high-RPM, wide-open throttle response that keeps
pulling right up to the redline. ECM calibration tuning is required to accommodate the
increased valve timing, and performance valve springs may be required for high-lift cams.
Stage II upgrade requires minor engine disassembly
to replace the cam. Adjustable pushrods allow
cam installation without removing the rocker box.
Special tools and ECM tuning are required.
SCREAMIN’ EAGLE ® 9
Milwaukee-Eight® Stage Upgrades
MILWAUKEE-EIGHT
STAGE III
STAGE I + CAM, BIG BORE CYLINDERS & PISTONS
The next step on the performance journey is to build a bigger engine. An increase
in engine displacement allows the engine to swallow more air and fuel, a higher
compression piston squeezes the air/fuel into a more volatile mixture, and when
combined, generates more power when ignited. A displacement and compression
increase provides torque increases throughout the entire RPM range with a 15-25%
improvement in the mid-range power. ECM calibration tuning is required to adjust
fuel flow and timing to accommodate the increased displacement.
Stage III bolt-on upgrade requires removal of the
engine’s top end and opening the cam chest.
Engine remains in the chassis and no machining is
required. Special tools and ECM tuning are required.
STAGE I
STAGE IV
INTAKE + EXHAUST + TUNING
The easiest and most cost effective step to improve your motorcycle’s performance
is to increase the airflow into and out of the engine. A high-flow air cleaner and
system-matched slip-on mufflers provide horsepower and torque improvements
you can feel throughout the RPM range, and serve as the core components for
all performance upgrades. ECM calibration is required to tune the fuel flow and
timing required to accommodate the improved airflow.
Stage I upgrade can be installed without engine
disassembly. No special tools are required. Requires
ECM tuning.
STAGE I + CAM, BIG BORE CYLINDERS, PISTONS, CYLINDER HEADS
& THROTTLE BODY
To maximize the impact of the increased displacement gained with Stage III updates,
the addition of free-flowing ported cylinder heads and a big bore throttle body top off
the performance build. Designed to satisfy the high-RPM, throttle-twisting rider, the
Stage IV update delivers 20-30% increase in power that keeps pulling right up to the
redline, without sacrificing mid-range torque. ECM calibration tuning is required to
add more fuel, and a higher-lift cam may be required to deliver maximum power.
Stage IV bolt-on upgrade requires removal of the
engine’s top-end and opening the cam chest.
Engine remains in the chassis and no machining is
required. Special tools and ECM tuning are required.
Street legal and/or street compliant statements refer to product meeting 50-State emissions and noise standards in the United States.
The street legal and/or street compliant statements may not apply to markets outside of the United States.
Street legal and/or street compliant statements refer to product meeting 50-State emissions and noise standards in the United States.
The street legal and/or street compliant statements may not apply to markets outside of the United States.