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


Step by Step instructions for
Installing a Camshaft in your Twin Cam 88/95

NOTE - Changing camshafts in Twin Cam 88 engine is different than in previous engines. Procedure requires use of hydraulic press and special tools. This installation should be undertaken only by experienced mechanic with access to Harley-Davidson service manual and all required Harley-Davidson tools or equivalent. Tightening fasteners to correct specifications with accurate torque wrench is mandatory.

CAUTION - Incorrect installation can cause engine damage not covered under warranty.

For reliable operation, it is  strongly recommends installing Andrews Sprocket Kit #33-4270 along with the camshafts. This kit is available from S&S and Andrews Products (773-992-4014), and through most aftermarket retailers. 


1. To remove stock pushrods which will not be reused, remove pushrod cover clips, collapse pushrod covers, place motorcycle in gear, and rotate engine to place lifters and pushrods for either cylinder at lowest point on camshaft. Piston for same cylinder will be at TDC on Compression stroke and pushrods will spin with light finger pressure.

CAUTION - Cutting pushrods with saw may result in metal chips entering engine and causing extensive engine damage not covered under warranty.

WARNING - Proceeding without pushrods in proper position can cause bodily injury. Cut pushrods with bolt-cutter and remove from engine. Rotate engine to place pushrods for other cylinder at lowest point and repeat procedure.

If stock pushrods are to be reused, remove motorcycle gas tank and top rocker covers. Remove rocker assemblies and pushrods according to procedure described in Harley-Davidson TC88 Service Manual.

2. Remove engine gear cover and gasket. It is not necessary to remove ignition sensor from cover. Secure lifters with magnets or tool made from large binder clip spring.

3. Rotate engine to align camshaft timing marks. 

4. Remove bolt and washer from 17 tooth crankshaft sprocket.

5. Remove bolt and washer from 34 tooth primary camshaft sprocket.

NOTE - Use H-D Sprocket Locking Tool #HD42314 to secure sprockets while bolts are removed. 

6. Use H-D tool #HD42313 (Cam Chain Tensioner Unloader) to swing primary cam chain tensioner away from chain. Secure with retention pin.

7. Working gradually around edge of sprocket, carefully pry sprockets off cams until loose on shaft. Remove sprocket/chain assembly and mark chain with arrow to indicate direction of travel. Chain should be reinstalled in same direction.

8. Remove chain guide. Gradually loosen and remove four oil pump bolts according to sequence described in "Bottom End Overhaul" section of H-D Twin Cam 88 Service Manual.  Gradually loosen and remove six support plate bolts according to sequence described in "Bottom End Overhaul" section of Service Manual. 

NOTE- Failure to remove or install bolts according to correct procedure may result in parts damage not covered under warranty.

9. Carefully remove cam support plate assembly from crankcase.  Use tool #HD42313 to swing remaining cam tensioner away from chain. Secure tensioner with second retention pin inserted through front of support plate. Do not remove pin until support plate assembly has been reinstalled in engine.

NOTE - It is not necessary to remove oil pump from engine to complete installation. However, installer must insure that oil pump o-rings are in good condition and remain in place during procedure. It is installer’s responsibility to replace o-rings if necessary.

10. Remove screws that secure bearing retainer to support plate and remove retainer from plate.

11. Carefully support cam support plate on table of hydraulic press. Using Harley-Davidson camshaft remover/installer tool #HD-43644, remove stock cams and bearings from support plate. 

NOTES: Bearings are usually damaged during removal and should not be reused. New cam bearings should be obtained from other source and installed with new cams. Mark secondary cam chain to indicate direction of travel. Chain should be reinstalled in same direction.

12. Apply assembly lube to outer race of cam bearing and inner race of support plate. Using tool #HD-43644 and hydraulic press, install cam bearings in support plate.

13. Apply thin film of assembly lube to bearing surface of camshafts and inner race of new cam bearings. Support bearings by inner race. Using tool #HD-43644, press cams into bearings.

14. Align cam timing marks and install secondary cam chain in original direction of travel.  Apply thin film of assembly lube to outer bearing race and bearing surface of cam support place and press cam/bearing assemblies into cam support plate.

NOTE: Rear cam has tapped hole in end of shaft. Front cam is slightly longer than rear cam. Place ram of press over front cam area of cam installation tool when beginning installation. Place ram over center of cam installation tool after both cams have engaged bearings and reached same installation height.

15. Using Loctite #243 (blue) on screw threads, reinstall bearing retainer and tighten screws to 20-30 in-lbs.

16. Remove cam needle bearings from crankcase with Harley-Davidson tool #HD42325 and replace with new bearings. Lubricate with clean engine oil.

17. Apply thin layer of assembly lube to cam journals and lobe surfaces. Align cams with needle bearings and carefully slide support plate assembly over crankcase dowels. Apply Loctite 243 to six support plate screws, install screws, and gradually tighten to 95 in-lbs. in proper sequence ill.

NOTE - Support plate assembly should slide into place without resistance. If resistance is encountered, determine cause before proceeding. Do not force plate assembly!

CAUTION - It is possible to  strip holes for support plate screws when using maximum 120 in-lb. maximum torque spec recommended by H-D. Holes stripped are those which pass through alignment dowels, Positions #1 & #2 in H-D diagram of Cam Support Plate/Oil Pump Torque Sequence.

18. Apply Loctite 243 to threads and reinstall four oil pump bolts according to procedure in H-D service manual: Gently bottom screws, then back out 1/4 turn. Center pump by rotating engine while snugging screws. Tighten bolts to 90-120 in-lbs. in sequence.

19. Instructions from Andrews Products must be followed to install new A/P sprocket:

One 3/16 drive key and three shims are supplied in each 34 tooth sprocket kit. Three shims are: .005", .010", and .020" thick. Andrews Products 34T sprockets are same length as stock sprockets plus .350" spacer (approximately .690" length). If stock sprocket used .350" spacer, no shim is required. If stock spacer is .355", use A/P .005" shim. If stock spacer is .360", use A/P .010" shim. If stock spacer is .365", use .005" and .010" A/P shim. If stock spacer is .370", use A/P .020" shim. Key provided in kit will require light filing for correct, tight fit in rear cam and sprocket.

CAUTION: Forcing or driving key into position can damage parts and result in extensive engine damage not covered under warranty. Length of key must not interfere with retaining washer. Shorten key if necessary.

NOTE - Following above procedure should result in correct sprocket alignment. However, S&S recommends checking alignment before proceeding. Temporarily install sprockets without chain and tighten sprocket bolts without Loctite to 25 ft-lbs. Straightedge can then be placed across sprocket faces and gap (if present) between straightedge and low sprocket measured with feeler gauge. Gap should be less than .005 in. If necessary, remove gear and install A/P shims to correct gap. Remove sprockets after alignment is confirmed and continue installation as described below.

20. Replace cam chain guide. Rotate cams until cam marks align. Confirm alignment with straightedge.

21. Insert screwdriver through hole in top of support plate and carefully pry up on tensioner. Remove retaining pin from secondary cam chain and confirm position of cam marks.

22. Maintaining original direction of travel indicated by arrow drawn in Step 7, place primary cam chain over sprockets. Rotate sprockets until marks align and slide sprockets over pinion shaft and rear cam.

NOTE - Flat surface on end of pinion shaft must face up toward center of rear cam for timing marks to align.

23. Apply red Loctite to threads of sprocket bolt and pinion bolt and a drop of clean 20W-50 engine oil beneath bolt heads. Use HD sprocket tool to secure sprockets and tighten bolts to 25 ft-lbs.

24. Carefully remove retaining pin.

25. Install outer cover with new gasket and tighten bolts to 90-120 in-lbs. in sequence illustrated in Figure 3. Replace any remaining parts removed to facilitate cam installation. Start engine and check for leaks.

Job Complete

copyright S&S Motors


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 -+-