and Technical information on ignition modules for Harley-Davidson motorcycles.
The Screamin' Eagle ignition system comes in several
different variations. The original Screamin' Eagle module had an external Rev Limiter that
was required to set the RPM limits below the modules preset 8000 RPM limit. There is now a
6000 RPM street module for Big Twin engines that is 50 states, emissions legal and
the original 'race only' unit. The modules replaces the stock HD ignition module,
requiring only that it be plugged into the stock wiring harness.
While Bike Tech does not have before and after
comparisons for the stock HD module vs. Screaming module(s), it does have experience with
the new 6000 RPM street module. This module has provided good service on a 1997 FXD
equipped with a modified CV carburetor, Screamin' Eagle Air Cleaner and Harley-Davidson
slash cut slip-on mufflers. Power for this engine combination is 64 HP at the rear wheels,
up from a stock 54 HP.
In the same 1997 FXD, adding an Andrews EV-46 raised
the power to 74 HP at the rear wheels. This only confirms our recommendation that the
Screamin' Eagle ignition module is a best buy for street and mildly modified engines.
In yet another improvement to the 1997 FXD, the
Screamin' Eagle ignition module performed was used with a set of the new Screamin' Eagle
1340 Evolution performance heads. The FXD's ignition performed flawlessly while producing
82 rear wheel horsepower. While it would have been nice to have a rev limiter greater than
6000 RPMs for a Stage 3 engine, the SE module was designed for street use where the 6000
RPM limit makes good sense.
The Screamin' Eagle Part numbers for 1340 engines