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Evolution Stage 1 Engine Development and Modification |
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Performance and
Technical information on stock engines for Harley-Davidson motorcycles.
Stage One Harley-Davidson engines involve no
internal changes to be made. All modifications are made by bolt-on changes or
modifications to external components on the engine. These components include air cleaners,
carburetors, exhaust systems and ignition systems. No special tools or training is
required to perform Stage One modifications. All the parts listed below are traditional Stage One components. The components listed have all been tested on Harley-Davidson engines. When installed and tuned properly, these components will improve the rear wheel horsepower of your big twin engine. Some popular, traditional items are not listed here. Components that have not been tested or did not improve the rear-wheel horsepower in testing various Big Twin engines are not listed. An example of components not being listed are drag pipes. Drag pipes, even when properly tuned, will not improve the street performance of your Harley-Davidson. Recommended Parts List for Bolt On PerformanceAir Cleaners
Carburetors
Exhaust Systems
Ignition Systems
Ignition Coils
Plug Wires
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