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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

TWIN CAM 88 Safety Recall for cam bolt breakage

On Friday January 8, 1999, the following message was sent by Harley-Davidson Motor Company to its Dealers. This is believed to be the exact and correct wording as written by Harley-Davidson. If you have further questions on this recall, Motorcycle Performance Guide recommends that you contact your local dealer for more information.

January 8, 1999


Dear Dealer/Distributor:

Harley Davidson has become aware that on certain 1999 model motorcycles the engine cam bolt could lose its clamp loading and/or break. This condition could cause the engine to quit running with or without prior warning. In some instances the engine could run erratically before quitting. Certain 1999 model motorcycles equipped with Twin Cam 88 engines ( engines which were built from the start of 1999 model year production through September 27, 1998 ) are affected. To help you identify motorcycles please reference the crankcase number stamped on the left side of the  engine. Affected 199 Twin Cam 88 engines must have a 99 stamped in position 3 and 4 and have numbers from 035 through 270 stamped in position 5 through 7.

Harley Davidson has voluntarily declared this a " defect related to motor vehicle safety" (Campaign 095) and plans to recall all potentially affected vehicles. A service bulletin containing complete details concerning this campaign will follow within 14 days. Owner notification, in accordance with NHTSA regulations, will follow the bulletin. In the interest of mutual customers, DO NOT SELL OR DELIVER any potentially affected motorcycles to your customers until the recall service has been performed. If you have sold any of these motorcycles, we urge you to contact the customers immediately to make them aware of this recall. All registered owners of affected vehicles will be notified by Harley Davidson to bring the vehicle in for recall service.



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 -+-