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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


Step by Step instructions for
Installing a Camshaft in your motorcycle
Page 4

Remove old cam bearing. Use a small, inside bearing or bushing puller to remove the cam bearing. Replace the old cam bearing with a new Torrington B-138. Do not use a late model H-D OEM bearing with any performance camshaft.

Tricks of the trade:

The old camshaft can be used as alignment tool and press for installation of the new bearing. Place the breather gear in place. The breather gear and pinion gear effectively form an alignment tool so the cam bearing on the old camshaft can be put in place with very little force required.

A few light taps on the end of the camshaft with a polyurethane or rubber mallet may be required to make sure the cam bearing is pressed completely into the engine case.

Place the new cam bearing on the installation tool or on the end of the old camshaft and install the new bearing.  When installing the Torrington bearing, remember to install it with the printed edge facing outward.Make sure the cam bearing is pressed completely into the engine case.

Aftermarket camshafts require a cam shim washer be placed over the rear of the camshaft prior to installation. Using a set of dial calipers, measure length of old cam from the front of the timing gear to the forward most area of cam bearing area. Measure the same length of the new cam. The difference should be between .050 and .060 inches. A shim of the proper length is required. If no caliper is available to measure the cams, install a .055 cam shim at rear of new camshaft. This is generally the correct shim to install.

Place the proper cam shim over the rear bearing surface of the new camshaft.

Place the thrust washer at the rear of the new camshaft.

Place a coating of assembly lubricant on the camshaft lobes, bearing, bushing areas and camshaft gear. This will protect the camshaft and lifters during engine startup. If assembly lube is not available, synthetic motor oil is a suitable alternative.

Figure 8
cam_install_08.jpg (6942 bytes) cam_install_10b.jpg (8388 bytes)
Breather Gear
Pinion Gear

Carefully place the new camshaft into the engine, making sure not to damage the lobe or bearing surfaces. Make sure camshaft alignment mark matches with mark on pinion gear.

Replace breather, making sure alignment marks on breather and cam gear line up. Place nylon washer on end of breather

Install the lifter blocks using new gaskets or remove the lifter holding tool, allowing the lifter to settle on the camshaft lobes.



cam_install_10.jpg (15691 bytes)
Figure 10

The engine should look like Figure 10. The new camshaft is in place. The lifters should be in place. It is a good time to check the work.

bulletIs the thrust washer in place?
bulletIs the proper shim on the camshaft?
bulletIs the pinion gear and cam gear aligned properly?
bulletIs the breather gear and the cam gear aligned properly?
bulletIs the nylon breather gear washer in place?

If the answer is yes to all the questions, it is time to proceed.

Replace gearcase cover gasket.

bulletReplacement of camshaft bushing and camshaft oil seal in nose come should be considered if the bike is over 5 years old or has over 50,000 miles on it.

Liberally squirt engine oil over the camshaft, cam gear, pinion gear and breather gear prior to closing up the engine. Place a few squirts of oil over the top of each lifter.


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 -+-