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


Stage 1 Modifications
Build a 70 horsepower
Twin Cam 88 engine

Performance and Technical information on basic modifications to a stock Harley-Davidson TC88 motorcycle engine.

Build the ultimate in a stock bike engine

One of the first things most people do shortly after they get their new motorcycle is start to modify the engine. In the time honor tradition of Harley-Davidson, the first thing to go on most bikes are the stock mufflers in an effort to improve the sound. This is usually the first in a long list of changes to the engine. Changes to the carburetor and ignition system also rank very high on the first to change list. These changes are done to improve the performance of the bike.

There are many companies out there that are competing for the dollars that Harley owners are willing to spend on their bikes. As an owner, you will be bombarded with a vast array of promises, claims and inaccuracies in an effort to get your money. Reading between the lines on many of the performance claims can be bewildering.

Does the Harley-Davidson world need another stock engine modification article? I decided it does, since the results obtained by the engine upgrades listed here provided significantly better results than those documented by the popular magazines aimed at the V-Twin crowd.

How to build your own Stage One engine

Stage One engines involve no internal changes to the engine. All modifications are made by bolt-on changes 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 these modifications, although it is recommended you are comfortable working on your own motorcycle.

Over the past several years we have installed and tested many manufacturers components. The list of parts used in building the ultimate 'bolt-on parts' engine is the end result of this testing. The best and least expensive of the individual components was selected and tested as a single package.

All the parts used are readily available through your Harley-Davidson Dealer except for the spark plug wires, which can be ordered directly through Magnecor. The components have installed and tested on a variety of bikes. All components were installed according to the manufacturer instructions supplied.

bulletBuilding the ultimate 'bolt-on parts' engine
Install the mufflers
Install the air cleaner kit
 Re-jet the carburetor
 Install some way to adjust the fuel map
Install the ignition module (carburetor only)
Install the ignition coil
Install the spark plug wires
Road test the bike
Dyno Tune the bike

The results of the dyno testing shows the power potential of the stock Twin Cam engine. Test results show engines producing over 70 horsepower and 72.5 ft. lbs. of torque. Dyno runs from multiple riders and bikes show the performance numbers produced where real. 

bulletDyno Sheet Twin Cam carburetor engine
bulletDyno Sheet Twin Cam EFI engine

The results are due to a well matched set of parts being bolted-on to the engine. Seems that a little of that money the Dealers send back to Milwaukee is going into engine performance research.

The ability to create the same results with other manufacturers parts is a distinct possibility. There is an optional parts list of components that should perform as well as the parts tested. Please be aware that the parts listed in the Optional Stage 1 parts list have not been dyno tested unless otherwise noted.

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Still not enough power for your needs? We decided to find out what happens when you take the Ultimate Stock Engine and make it a Stage 2 bike. There are more surprises ahead as we continue to step up the power in our "Ultimate Engine"  modifications series of articles.

bulletNeed a little more power?

The Parts List for Bolt On Performance

Dyno Tuning costs estimated at $150.00 plus tax.

  Harley Parts Optional Parts Other Options  
Air Cleaner Screamin Eagle Air Cleaner Kit K&N Air Filter Element    
Carburetor Upgrades DynoJet Carburetor Recalibration Kit ThunderSlide Kit Mikuni HSR-42
CV Rejet with HD parts
EFI Upgrades Screamin Eagle Stage I
SE Race Tuner
SE Race Fueler
Techlusion TFI
PowerCommander 2
Exhaust System Screamin Eagle Slip-on Mufflers Khrome Werks Slip-on Mufflers SuperTrapp 2-1
Khrome Werks AR Exhaust system
Ignition System
(carb bikes only)
Screamin Eagle Crane    
Ignition Coil
Screamin Eagle Crane    
Plug Wires   Magnecor 8.5 mm Harley-Davidson Plug wire set
Other Items H-D Gold Spark Plugs

Harley-Davidson Oil Filter

20w50 Synthetic Motor Oil (3 quarts)

75w-90 Synthetic Transmission Oil (1 quart)

Harley-Davidson Primary Chaincase Lubricant 
(1 quart)

The Horsepower Gallery provides an extensive list of bikes , the power they produced and the major engine components.


Table of Contents
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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 -+-