Get XiED(tm)! Performance Parts

Don't let the Harley heat monster ruin your riding.
Reduce  Engine Surging
Improve Throttle Response
Reduce Engine Ping


HD 2007/2008 Engines

High Heat on 2007/08 HD engines

HD 2007/08 Performance Recommendations

Cool your exhaust temperature with the Wide Band O2 upgrade for 2007/08 HD

Harley Camshaft Specification Tables

HD Twin Cam Engine Builds
TC 128 HP 95 CID
TC 100HP Street Engine

The basics of Fuel Injection explained

Rammer Performance Air Cleaners
TC Performance Heads 100+HP

Pro Tuning on a Shade Tree Budget

Harley-Davidson Evolution

Stage 1 Engine Development and Modification

Performance and Technical information on stock engines for Harley-Davidson motorcycles.
Motorcycle Performance Guide is now providing tuning information for Harley-Davidson Twin Cam 88 and EVOLUTION engines. For Twin Cam 88 engine information, look for the TC88 label next to the horsepower number.

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.
These modifications will provide from 55 to 66 horsepower at the rear wheel of a late model 80 CID Harley-Davidson big twin Evolution engine.

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 Performance

Air Cleaners

Screamin' Eagle Air Cleaner Kit
K&N Air Filer


Stock Keihin CV (Modified by one of the following methods)
- Harley jets with 'do-it-yourself' modifications
- DynoJet carburetor re-calibration Kit
- DynoJet ThunderSlide Kit
- Yost Power Tube

Mikuni HSR-42
Screamin Eagle 44mm CV

Exhaust Systems

Screamin' Eagle Slip Ons
SuperTrapp 2-1
Cycle Shack 2-2 Slash Cuts
Hooker 2-1
Python III

Ignition Systems

Screamin' Eagle
Crane HI-4E
Dyna 2000

Ignition Coils

Screamin' Eagle

Plug Wires

Screamin' Eagle

Build a 64 HP Stage 1 engine
EVO 63 HP for $150


Table of Contents
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Modification, Installation, Maintenance and Tuning Index  will help you find most of the information you want on one page.

How to get Professional Tuning Results at home
Testing the Innovate Motorsport LM-1 portable air fuel meter

Profession Tuning on a Shade Tree Budget

Veypor VR2 Data Logger and Instrument Panel
Video Installation and Demo
Purchase VR2

Engine Performance
How to Build a
TC96 2007 Engines
TC88 70HP Stage1  
TC95 128HP Stage 3
TC95 100HP Street
TC96 2007 Stage 1/2
EVO 64 HP Stage 1
EVO 74 HP Stage 2
EVO 82 HP Stage 3
EVO 95 HP Stage 3
883 to 1200 Upgrade
Shovelhead Modifications

New EFI for EVO and TC

Performance Gallery
Horsepower Gallery
Evolution 80
Twin Cam 88/95
Evolution Unlimited
Sportster Unlimited
Drag Strip Gallery
Land Speed Racing Gallery
CV Carburetor
Modifying the CV carb
Tuning a CV carb
Selecting a cam
Install a TC 88/95 cam
Install a Big Twin cam
Install Sportster cams

Camshaft Specifications
Twin Cam

Exhaust Systems
EVO Exhaust Testing
TC Exhaust Testing
Khrome Werks AR100 test
Making Drag Pipes Work

Shop Manual
Carburetor Troubleshooting
Finding Manifold Leaks
Cylinder Heads
Pistons and Cylinders
Belt Drive
Shop Manual Appendix
$20 Bike Lift
Plug Wires
Spark Plugs
Engine Tuning
Nitrous Oxide
Motor Oil
Stutter Box
General Information
WEB Links
Buy Books and Manuals
Performance Calculations
Estimate Horsepower
Estimate 1/4 Mile Time
Estimate Top Speed

Engine Displacement
Exhaust Length
Gear Ratios
Air Density

The Nightrider Diaries
The ramblings of a genius a, a madman and something in between.

Where is Sifton Cams?

Autocom Active-7 tested

Harley-Davidson EFI
-EFI basics explained
-EFI modifications explained

183 HP, 2 carbs, 2680cc

Copyright 1997-2006  Stephen Mullen, Oldsmar, FL -+-