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

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Motorcycle Performance Guide

Tune your stock bike for 64 rear wheel horsepower. You can create this powerful Stage 1 engine using parts from your local Harley-Davidson dealer.

Carburetor modifications and upgrades are second only to exhaust system upgrades when you get a new bike. Here are some inexpensive modifications, CV parts numbers for upgrades and tuning tips for all carburetors.

The ability of a new ignition system on an engine to produce additional horsepower is overrated. Does that ignition system really add horsepower? And what about single versus dual fire ignition? And don't forget about ignition coils and spark plug wires. If you were confused, a little information should help clear the air.

A performance camshaft is the order of the day when the desire for additional horsepower hits you after your Stage 1 tuning. You have just moved into Stage 2 engine territory. What is the correct camshaft to meet your need for speed and power? The Motorcycle Performance Guide provides some tips for picking   your camshaft and the most extensive list of camshaft specifications for Harley-Davidson engines available anywhere.

Cylinder head changes, porting and polishing are the buzz words when it comes to making high horsepower. What does a "good" set of heads look like? What does polishing really do for an engine? There are things that can be done to an engine that might give better results that big ports, giant intake valves and a fancy polishing job.

Want to know what engine modifications work? Here is an extensive group of mild to wild engine combinations producing horsepower to well over 150. A dyno sheet and a detailed list of the engine components are included with each description. From mild Stage 1 engines to wild Stage 4 engines, you'll find something of interest to you.

The drive train in your Harley-Davidson is an overlooked item. Overlooked until something fails. When your engine combination is above Stage 1, it is important that you have a heavy duty clutch and critical that you know how to adjust a belt drive.

The Horsepower Gallery is your quick reference for engine combination horsepower figures. Maximum horsepower figures are listed for engine size, cylinder head work, camshaft, carburetor and pipes. If someone promises your bike will make more horsepower than the engines listed here, make sure the shop really knows what it is doing. If a shop doesn't dyno tune, beware of horsepower promises over 70.


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 -+-