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


Contact the Sprocket Twins

Our illustrious staff of experienced professionals is always willing to help you. Norton, Vincent and Harley, more commonly known as the Sprocket Twins are always willing to assist you in answering your most pressing questions. Since all three of the twins have stayed at a Holiday Inn Express, they have the expertise to help you in your quest for the perfect high performance Harley-Davidson engine. There is speculation that the Sprocket Twins are related to the Click and Clack, the Tappet brothers of NPR fame, but none of them will confirm or deny the story. If this is true, this could also contribute to their ability to provide uniquely abstract answers to perfectly simple questions.

Considering all the facts, if you are still willing to trust your life to answers from the Sprocket Twins, send your questions to us. Make sure you address your question to the appropriate twin. Most questions get a response within 5 days. Sometimes you'll even get an answer that makes sense.

Make sure you e-mail address is correct. You would be surprised how many people have improper return e-mail address. We can't respond unless we have a correct return address. We try to answer all e-mail, but we get a huge volume of mail every day and a lot of spam. We occasionally delete your questions when eliminating the spam from our inbox. We apologize if we don't get to your question, but our staff is limited.

Send your questions to us

Attention Comcast Subscribers

Nightrider is unable to return your e-mail messages. Comcast blocks all email, claiming it is Spam. Nightrider has never spammed any users, but Comcast has chosen to block us. Our attempts to contact Comcast and identify the source of their problem has gone unanswered. If you are a Comcast subscriber and want a response from Nightrider, you need tell Comcast to accept e-mail from Nightrider or provide an alternative e-mail address .

We are looking for Comcast customers that will contact the security department to determine what they claim the problem is with Nightrider. We have tried to contact the company multiple times in an effort to resolve this situation, but they refuse to respond to us. The technical information Comcast security will want is "reason: 550 blocked by ldap:ou=rblmx,dc=comcast,dc=net -> BL004 Blocked for spam.". If anyone can get a complete explanation or get the Block removed, we would greatly appreciate it.

Thank You.

Introducing the Sprocket Twins

Norton is the performance guru. He's the one that takes a perfectly streetable engine and turns it into a drag race bike with no possibility of riding it on the street. Then he takes it out on the road to challenge the Sport bikes. He may not always win, but he gets their attention.  No nonsense, no sense of humor, and no extra money 'cause he spent it all on performance parts. "Go fast" is all he knows.

Vincent likes to do strange things to his bike and his body. He has been known to cut pieces of his body off and will do the same to his bike. He often adds tribal touches to both. He looks at the world in a different reality than most of us. He is the most creative of the Sprocket Twins. Some may call him crazy, but when he provides an answer it is usually something that would make Mr. Ness want to work on Honda Shadows.

Harley can't make his mind up what he wants be when he grows up. One day he's working on performance, the next day he's adding chrome and he's always talking about the next bike. Nobody is quite sure if rides a Pan, Shovel, EVO or Twin Cam. There is even a rumor that he rides a Sportster. His first ride was a Cushman Eagle. He is a firm believer in "Live to ride, ride to drink and drink to fall down". His answers will be appropriately worded.  


Table of Contents
Search the site 
Nightrider COPYRIGHT

Ask us a Question

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 -+-