Instruction 106-5893
S&S Cycle, Inc
Copyright © 2009–2013
by S&S® Cycle, Inc.
14025 Cty Hwy G PO Box 215
Viola, Wisconsin 54664
07-10-13
®
.
Phone: 608-627-1497 • Fax: 608-627-1488
Technical Service Phone: 608-627-TECH (8324)
Technical Service Email: sstech@sscycle.com
Website: www.sscycle.com
All rights reserved.
Printed in the U.S.A.
Installation Instructions: S&S® Standard and Easy Start
Gear Drive Cams for Harley-Davidson® Twin Cam 88® Engines
1999–2006 Big Twin, except 2006 Dyna® models
DISCLAIMER:
S&S parts are designed for high performance, closed course, racing
applications and are intended for the very experienced rider only. The
installation of S&S parts may void or adversely affect your factory warranty.
In addition such installation and use may violate certain federal, state, and
local laws, rules and ordinances as well as other laws when used on motor
vehicles used on public highways, especially in states where pollution laws
may apply. Always check federal, state, and local laws before modifying your
motorcycle. It is the sole and exclusive responsibility of the user to determine
the suitability of the product for his or her use, and the user shall assume all
legal, personal injury risk and liability and all other obligations, duties, and
risks associated therewith.
The words Harley®, Harley-Davidson®, H-D®, Sportster®, Evolution®, and all
H-D part numbers and model designations are used in reference only. S&S
Cycle is not associated with Harley-Davidson, Inc.
IMPORTANT NOTICE:
Statements in this instruction sheet preceded by the following words are of
special significance.
WARNING
Means there is the possibility of injury to yourself or others.
CAUTION
Means there is the possibility of damage to the part or motorcycle.
NOTE
Other information of particular importance has been placed in italic type.
S&S recommends you take special notice of these items.
WARRANTY:
SAFE INSTALLATION AND OPERATION RULES:
Before installing your new S&S part it is your responsibility to read and follow
the installation and maintenance procedures in these instructions and follow
the basic rules below for your personal safety.
Gasoline is extremely flammable and explosive under certain conditions
and toxic when breathed. Do not smoke. Perform installation in a well
ventilated area away from open flames or sparks.
If motorcycle has been running, wait until engine and exhaust pipes
have cooled down to avoid getting burned before performing any
installation steps.
Before performing any installation steps disconnect battery to eliminate
potential sparks and inadvertent engagement of starter while working
on electrical components.
Read instructions thoroughly and carefully so all procedures are
completely understood before performing any installation steps.
Contact S&S with any questions you may have if any steps are unclear or
any abnormalities occur during installation or operation of motorcycle
with a S&S part on it.
Consult an appropriate service manual for your motorcycle for correct
disassembly and reassembly procedures for any parts that need to be
removed to facilitate installation.
Use good judgment when performing installation and operating
motorcycle. Good judgment begins with a clear head. Don’t let
alcohol, drugs or fatigue impair your judgment. Start installation when
you are fresh.
Be sure all federal, state and local laws are obeyed with the installation.
For optimum performance and safety and to minimize potential
damage to carb or other components, use all mounting hardware that is
provided and follow all installation instructions.
Motorcycle exhaust fumes are toxic and poisonous and must not be
breathed. Run motorcycle in a well ventilated area where fumes can
dissipate.
••
••
••
••
••
••
••
••
••
All S&S parts are guaranteed to the original purchaser to be free of
manufacturing defects in materials and workmanship for a period of twelve
(12) months from the date of purchase. Merchandise that fails to conform to
these conditions will be repaired or replaced at S&S’s option if the parts are
returned to us by the purchaser within the 12 month warranty period or within
10 days thereafter.
In the event warranty service is required, the original purchaser must call or
write S&S immediately with the problem. Some problems can be rectified by a
telephone call and need no further course of action.
A part that is suspect of being defective must not be replaced by a Dealer
without prior authorization from S&S. If it is deemed necessary for S&S to
make an evaluation to determine whether the part was defective, a return
authorization number must be obtained from S&S. The parts must be packaged
properly so as to not cause further damage and be returned prepaid to S&S
with a copy of the original invoice of purchase and a detailed letter outlining
the nature of the problem, how the part was used and the circumstances at
the time of failure. If after an evaluation has been made by S&S and the part
was found to be defective, repair, replacement or refund will be granted.
ADDITIONAL WARRANTY PROVISIONS:
(1) S&S shall have no obligation in the event an S&S part is modified by any
other person or organization.
(2) S&S shall have no obligation if an S&S part becomes defective in whole or
in part as a result of improper installation, improper maintenance, improper
use, abnormal operation, or any other misuse or mistreatment of the S&S part.
(3) S&S shall not be liable for any consequential or incidental damages
resulting from the failure of an S&S part, the breach of any warranties, the
failure to deliver, delay in delivery, delivery in non-conforming condition, or
for any other breach of contract or duty between S&S and a customer.
(4) S&S parts are designed exclusively for use in Harley-Davidson® and other
American v-twin motorcycles. S&S shall have no warranty or liability obligation
if an S&S part is used in any other application.
SPECIFICATIONS FOR S&S® GEAR DRIVE CAMSHAFTS FOR HARLEY-DAVIDSON® TWIN CAM 88® ENGINES
Timing
Cam
Name
Lobe
475G
509G
510G
(e*)
Open
99-04
Models
Close
Duration
Int
2°
34°
216°
Exh
36°
4°
220°
Int
18°
18°
216°
Exh
46°
11°
237°
Int
20°
38°
238°
Exh
52°
20°
252°
551G
(e*)
Int
17°
19°
216°
Exh
41°
17°
238°
570G
(e*)
Int
20°
40°
240°
Exh
55°
20°
255°
Int
5°
18°
203°
Exh
58°
24°
262°
Int
20°
45°
245°
Exh
60°
20°
260°
Int
20°
55°
255°
Exh
60°
20°
260°
Int
25°
60°
265°
Exh
65°
25°
270°
Int
25°
60°
269°
Exh
74°
275°
583G
(e*)
585G
(e*)
625G
(e*)
640G
(e*)
675G
(e*)
25°
Lift
0.475"
0.509"
0.510"
0.550"
0.570"
0.583"
0.585"
0.625"
0.640"
0.675"
Centerline
106°
.060"
106°
.060"
90°
.0174"
107.5°
0.140"
99°
0.187"
106°
0.179"
91°
0.178"
102°
0.170"
100°
0.187"
107.5°
0.179"
96.5°
0.113"
107°
0.206"
102.5°
0.186"
110°
0.179"
107.5°
0.189"
110°
0.184"
107.5°
0.228"
110°
0.214"
109.5°
0.235''
112.5°
0.205"
Works
with stock
pushrods
Works with
stock valve
springs
Works with
stock valve
springs
X
X
X
X
X
X
X
X
X
X
X
X
X
Chart 1
*Easy Start Camshafts
INTRODUCTION
Important Note: Pinion shaft run out must be verified before
installing gear drive camshafts. (.003" max)
Cam
TDC Lift
05-UP
Models
•S&S easy start cams were designed to work with specific
compression ratio and displacement combinations. If an Easy Start
cam set is used in an application other than what it was designed
for occasionally an engine may not build the required compression
to start the bike.
•Cranking compression numbers are no longer a valid health check
of the engine. We recommend performing a leak down test.
•If the lifters have been disassembled or bled down for any purpose,
the starter may have difficulty with the initial start. Although the
decompression lobe lifts the lifter body, the lifter is not pumped up
and it will not lift the exhaust valve. You may need to remove the
spark plugs and crank the engine to get oil pressure to the lifters.
•Easy Start cams require no special service. If they are ever removed
for any reason however, inspect the mechanism for wear and verify
that the lever operates smoothly.
•If your bike is carbureted, the starting routine may be slightly
different, allow yourself time to experiment to find the best method.
•When the engine is turned off, you may hear a slight click ass the
decompression lever resets. This is normal and does no harm.
•If engine speed drops below 900 RPM, you may hear clicking as
the decompression lever starts engaging. Idle speed should be
adjusted higher. The engine idle should be set at 1000-1100 RPM.
Intended Displacement Intended Compression Ratio
551
88–106
9.0–10.0
570
88–106
9.0–10.0
583
88–106
9.0–10.0
585
88–106
9.2–10.5
625
95+
10.0–10.75
640
95+
10.5–11.5
675
120+
11+
OVERVIEW OF EASY START CAMSHAFTS (IF EQUIPPED):
S&S® developed Easy Start cams to assist starting with a built in
centrifugal compression release. The operation is simple: at cranking
speeds a spring loaded decompression lever holds the exhaust valve
open slightly. Once the engine fires and exceeds 750 RPM, centrifugal
force takes over and sends the lever to a retracted position, allowing
the engine to run normally.
Important Notes Regarding Easy Start Camshafts:
•Stock EFI engines require a minimum of 80 PSI cranking
compression, checked with the throttle open, for the ECU to fire the
spark plugs.
COMPATIBILITY NOTES:
Pinion shaft run out must be verified before installing gear drive
camshafts. (.003" max)
S&S® Gear Drive Cams are not compatible with camshafts designed for
••
••
2
••
••
the stock chain cam drive. S&S Gear Drive Cams must be used with S&S
gear drive camshafts.
Except for the 475G, 509G, and 510G, the S&S® driven camshaft kits are
not compatible with stock pushrods or valve springs. S&S adjustable
pushrod kit 93-5095 is recommended for engines with stock length
cylinders. Longer pushrods are available for engines with longer than
stock cylinders. See the S&S catalog for pushrods and valve springs.
S&S Camshaft Installation Kit 106-5896 is strongly recommended when
installing S&S gear drive cams. The kit includes gaskets and bearings
required for installation. It also includes the scavenge side oil pump
oring.
WARNING
Failure to install components correctly can result in sudden
engine seizure. Engine seizure may result in serious injury to
motorcycle operator, passenger, or others.
A. Disconnect battery ground cable to eliminate potential sparks and
inadvertent engagement of starter while working on motorcycle.
B. Remove spark plugs and pushrod cover clips. Collapse pushrod
covers to expose pushrods.
C. Safely elevate and stabilize rear of motorcycle. Place transmission
in high gear. Turn rear wheel to rotate engine until both lifters and
pushrods for either cylinder are at lowest point on camshaft (TDC
of compression stroke). Both intake and exhaust pushrods for that
cylinder will not be under pressure from the valve springs and will
rotate with light finger pressure.
NOTE: S&S 475, 509G, and 510G camshafts may be installed with stock
style non-adjustable pushrods instead of adjustable pushrods. If installing
non-adjustable pushrods, disassemble and assemble rocker box per
Harley-Davidson® instructions. All other S&S® gear drive cams require
adjustable pushrods. As a time-saving measure, the stock pushrods can be
removed with bolt cutters. Be sure to heed cautions and warnings in these
instructions.
CAUTION
1999-'04 stock valve springs will accommodate cam shafts with up
to .510" lift. This includes S&S 475, 509 and 510 cams. 2005 and
later stock valve springs can accommodate camshafts with up to
.585" lift. If cams are installed that exceed the lift capacity of the
stock valve springs, a set of high performance valve springs must
be installed that can handle the additional lift. Stock 2005 and
later springs are good to S&S lifts.
•• When using S&S gear drive camshafts with stock Harley-Davidson®
••
••
pistons, valve-to-piston clearance may need to be checked. Clearance
should be at least .060" intake and .080" exhaust.
If stock Harley-Davidson® heads are decked, valve to piston clearance
must be checked. If insufficient clearance is found, valve pockets must
be modified. Clearance should be a minimum of .060".
When using S&S pistons with S&S heads which are unmodified or
have been decked no more than .062", no additional valve to piston
clearancing will be required.
D. If the stock pushrods are to be reused, follow the procedure in the
Harley-Davidson® service manual for pushrod removal. If stock
pushrods will not be reused, they may be cut out of the engine to
save time. Cut pushrods for cylinder that is at TDC with bolt cutter
and remove pushrods and pushrod covers from engine. Rotate
engine to place pushrods for other cylinder at their lowest point.
Cut and remove remaining pushrods.
INSTALLATION
•Special Tools Required
•Sprocket locking tool H-D® #42314
•Cam chain tensioner unloader H-D® #42313
•Camshaft remover/installer H-D® #43644
•Needle bearing remover/installer H-D® #42325
•Dial indicator and flex arm
CAUTION
Cutting pushrods with a saw or cutoff wheel may result in debris
entering engine, causing extensive engine damage not covered
under warranty.
WARNING
Cutting pushrods when they are under spring pressure can result in
pushrod parts being ejected with considerable force, and can cause
bodily injury.
1- Remove Cam Chain Drive
NOTES:
Installation procedure is different than in previous engines. Procedure
requires use of a hydraulic press and some special tools. Installation
should be done by an experienced mechanic with access to a factory
service manual and all required tools.
Tighten all fasteners to correct specifications and in order described.
Always use an accurate torque wrench.
••
E. Remove lifter covers from crankcase. Lifter covers do not have
to be removed if stock non-adjustable pushrods or S&S Quickee
pushrods are to be installed.
F. Remove engine cam cover and gasket. It is not necessary to
remove ignition sensor from cover. Secure lifters with a magnetic
tappet tool or a tool made from a large binder clip. See Picture 1
below left.
G. Remove bolts and washers from cam drive sprocket and crankshaft
sprocket.
••
CAUTION
Incorrect installation can cause engine damage not covered
under warranty.
Picture 1
Picture 2
3
NOTE: S&S® recommends using Harley-Davidson® sprocket locking tool
H-D® #42314 to secure sprockets while bolts are being removed. See
Picture 2 previous page.
CAUTION
Failure to remove and install bolts according to correct procedure
may result in parts damage not covered under warranty.
M. Carefully remove cam support plate assembly from case.
N. Check pinion shaft runout. Place an indicator on the end of
pinion shaft at cam support plate bushing surface and rotate
engine; reading must be .003" or less total indicated runout
(TIR). If reading is greater than .003" TIR the crankshaft must be
repaired or replaced to correct excess runout before installing
gear drive cams.
H. Use Harley-Davidson® cam chain tensioner unloader H-D®
#42313 to move tensioner away from primary cam chain. Secure
tensioner with retention pin. See Picture 3 below.
CAUTION
Check pinion shaft runout before installing gear drive cams.
Indicate end of pinion shaft at cam support plate bushing surface
and rotate engine; reading must be .003" or less total indicated
runout (TIR). If reading is greater than .003" TIR the crankshaft
must be repaired or replaced to correct excess runout before
installing gear drive cams. Failure to correct excess runout may
lead to engine damage not covered under S&S warranty.
NOTE: If grinding is to be done all gear case components must be removed
and all holes taped off with duct tape to avoid contamination of engine
with chips.
Picture 3
I. Working gradually around edge of each sprocket, carefully pry
sprockets loose. Remove sprocket and chain assembly.
J. Remove chain guide. See Picture 4 below.
O. Use Harley-Davidson® cam chain tensioner unloader H-D®
#42313 to move tensioner away from secondary cam chain.
Secure tensioner by inserting second retention pin through front
of support plate.
P. Remove bearing retainer screws and bearing retainer from cam
support plate.
Q. With cam support plate positioned securely in a hydraulic press,
use Harley-Davidson® camshaft remover/installer H-D® #43644
to press both camshafts and bearings from support plate
simultaneously.
NOTES:
Cam bearings may have a loose fit in cam support plate. Camshaft and
bearing assemblies may drop out when beginning pressing procedure.
Camshafts with roller style bearings will be loose and drop out of support
plate.
The S&S® Gear Drive Cams require that ball bearings be used for both
front and rear outer camshaft bearings to ensure consistent center to
center distance between the gears. Since the gear drive does not exert a
large side load on the rear camshaft, the higher load handling capacity
of the stock roller style bearing is not required.
••
••
Picture 4
K. Following sequence shown, alternately loosen and remove oil
pump bolts. See Figure 1 below left.
L. Following sequence shown, alternately loosen and remove cam
support plate bolts. See Figure 2 below right.
Figure 1
Figure 2
All references to Harley-Davidson® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s products are original equipment
parts or that they are equivalent to the corresponding Harley-Davidson® part number shown.
4
Picture 5
Picture 6
securing inner gears to cams. Remove material from retainer, to provide
.030" clearance between key and retainer. See Picture 9 below.
R.Use Harley-Davidson® cam chain tensioner unloader H-D®
#42313 to remove retention pin from either tensioner. Allow
tensioner to completely relax. Remove retaining ring and
tensioner assembly from cam support plate. Repeat this
procedure for remaining tensioner.
D. Align hole in bearing retainer with oil passage in support plate.
Install bearing retainer screws with a drop of blue Loctite®
threadlock 242 or 243 and tighten screws to 20-30 in-lbs. torque.
If your cam support plate is missing the oil hole between the
cams don’t be alarmed as some cam support plates have the hole
in a new location above the rear cam, see Picture 7, below.
2-
Install Gear Drive Cams
NOTE: Do not reuse cam bearings. If S&S Camshaft Installation Kit 1065896 is not being used, new bearings should be obtained from another
source and installed with new camshafts. The S&S Gear Drive Cams
require that ball bearings be used for both front and rear camshaft outer
bearings.
A. When using 551G, 583G, 585G, 625G, or 640G camshafts (335168, 33-5170, or 33-5172) clearance between pinion bearing
boss and rear cam lobe must be checked. See Pictures 5
& 6 above. Remove just enough material to provide .030"
clearance between top of cam lobe and pinion bearing boss
when camshaft is rotated in inner needle bearing. Also check
clearance between all cam lobes and tappet guide bosses. To
avoid contamination of engine with chips, we recommend that
all holes in the gear case be taped off with duct tape and that
gear case be thoroughly cleaned with parts cleaner or solvent
after clearancing is performed.
B. Carefully remove camshaft needle bearings from crankcase with
Harley-Davidson® camshaft needle bearing remover/installer
H-D® #42325, and replace them with new bearings provided in
S&S Camshaft Installation Kit 106-5896, or with bearings from
another source. Cam bearings must be Torrington B148 full
complement bearing or equivalent.
C. Apply assembly lube to outer races of cam bearings and bearing
bores in support plate. With cam support plate positioned
securely in a hydraulic press, use Harley-Davidson® camshaft
remover/installer H-D® #43644 to install both bearings. See
Picture 8 below.
Picture 7
E. Apply assembly lube to outer bearing surface of front (shorter)
camshaft and inner race of front bearing. Support bearing by
inner race and press camshaft all the way into bearing. Install
retaining ring on outer end of front camshaft.
NOTE: Do not reuse retaining ring. If S&S Camshaft Installation Kit 1065896 is not being used, a new retaining ring be obtained from another
source and installed with new camshaft.
F. Apply assembly lube to outer bearing surface of rear (longer)
NOTE: Check clearance between bearing retainer and woodruff keys
If additional clearance is required, remove
material from areas indicated to provide
.030" clearance between key and retainer .
Picture 8
5
Picture 9
camshaft and inner race of rear bearing. Support bearing by
inner race and with camshaft gear timing marks aligned (See
Figure 3 below), press camshaft all the way into bearing.
NOTE: Before reinstalling cam support plate, replace oil pump
scavenge o-ring (supplied in kit) even if the original appears to be in
good condition. The stock o-ring can become brittle and provide a poor
seal if reused.
NOTES:
Crankshaft and cam drive gears have a light press fit on their respective
shafts. Start gears squarely on their shafts and use their mounting bolts
to pull them all the way into position.
Make sure that no metal burrs are raised when installing the gear sets.
Burrs can form underneath the gear causing excessive gear run out.
J. Place drive gear key in rear camshaft. Position rear cam drive
gear on rear camshaft and key with timing mark outward.
K. Apply a drop of red Loctite® threadlock 262, 271 or 272 to
threads of 3⁄8"-24 x 1.75 Grade 8 cam drive gear bolt. Apply a drop
of clean 20W-50 engine oil under bolt flange. Using thick washer
provided, install cam drive gear bolt and tighten to 34 ft-lbs.
torque. Cams should rotate freely with no binding.
L. Place a dial indicator on a tooth of the rear cam drive gear so that
it measures the movement of the teeth of the rear cam drive gear
at as close being in line with the direction of rotation as possible.
This can be done with a “finger” on the probe as shown in Picture
X, or by other arrangement. Dial indicator can be secured with
a flex mount or by bolting it to the crankcase at the gear cover
surface.
M. Hold the front cam with finger pressure to keep it from rotating,
and rock the rear cam drive gear back and forth. Record the
amount of gear tooth movement as shown on the dial indicator.
Repeat this measurement in four positions at 90° intervals of
cam gear rotation. Divide the readings by 2 to correct for the
difference in diameters in the inner gears and the outer drive
gear. The lowest of the readings after dividing by 2 should be
between .0005" and .001". If backlash is not correct, inner rear
cam gear must be replaced with either oversized or undersized
inner gear. These gears are not included in the cam kit. See line
drawing on page 8 for part numbers.
••
••
G. Apply a thin layer of assembly lube to cam journals, lobe
Figure 3
surfaces, and inner bearing surfaces. Thoroughly lubricate
decompression lever of Easy Start Cams. Align camshafts with
needle bearings and carefully slide support plate over crankcase
dowels.
NOTE: Support plate assembly should slide into place without resistance.
If resistance is encountered, determine cause and correct problem before
proceeding. Do not force support plate into position!
CAUTION
Too much backlash can cause excessive gear noise or clicking
caused by the reversing of the forces applied by the lifters to the
cam lobes. Insufficient backlash, will cause gears to whine, wear
prematurely, create excess heat, and may cause breaking of the
gear teeth and engine failure
H. Loosely install support plate screws with a drop of Loctite®
threadlock 242 or 243 (blue). Alternately tighten screws to 95
in-lbs. torque following sequence shown. See Figure 2 Page 5.
CAUTION
Support plate screws that pass through alignment dowels (See
positions 1 & 2 in Figure 2) can be easily stripped when applying
maximum 120 in-lbs. torque as recommended by HarleyDavidson®.
NOTE: The rear cam drive gear is slightly larger than the stock drive
sprocket and needs to be checked for interference with cam cover before
proceeding.
I. Install oil pump mounting bolts with a drop of Loctite®
threadlock 242 or 243 (blue) according to procedure found
in factory service manual: Gently bottom screws, then back
them out 1⁄4 turn. Center oil pump by rotating engine by hand
while snugging down screws. Alternately tighten bolts to 95
in-lbs. torque in sequence shown. See Figure 1 Page 4. Before
moving forward, verify that inner drive gears rotate freely and
no binding is present.
N. Place transmission in high gear and turn rear wheel to rotate
engine so that when the crankshaft pinion gear is installed, the
timing mark will line up with the timing mark on the rear cam
drive gear. See Figure 4 below left.
O. Place pinion gear on the pinion shaft with timing mark outward.
Apply a drop of red Loctite® threadlock 262, 271 or 272 to threads
of 5⁄16"-18 x 3⁄4" Grade 8 crankshaft gear bolt, provided in S&S®
Camshaft Installation Kit 106-5896 or obtained from another
source. Apply a drop of clean 20W-50 engine oil under bolt
Figure 4
Figure 5
6
E Pushrod Installation And Adjustments
1. Using Stock Non-Adjustable Pushrods
NOTE: Using stock pushrods is only possible if the camshafts installed have
the same base circle as stock, and no more than .585" lift. S&S® labels these
cams as “Bolt-In” for easy reference. Currently S&S 475, 509, and 510 cams
are bolt-in.
a. Rotate engine so one piston is at TDC compression, by rotating
the rear tire while feeling the tappets. When both tappets are at
the bottom of their travel, and the cylinder is at TDC, the cylinder
is at TDC compression.
b.Insert the pushrods into the collapsed pushrod tubes. Make sure
the proper o-rings are installed in the tappet covers, and on the
cylinder head end of the pushrod covers.
c. Verify the correct locations for the pushrods that were removed.
The longer pushrods go in the exhaust locations and the shorter
pushrods are for the intakes.
d.Insert the top of the pushrod into the hole in the head, then
drop the bottom into the tappet cover.
e. Apply assembly lube or suitable clean engine oil to the pushrod
tips where they will contact the rocker arms.
f. Insert the rocker arm support assembly into the rocker box.
g.Ensure that the pushrod tips are fully engaged in the rocker
arms.
h.Apply Loctite® 243, then evenly snug the four 5/16" bolts which
hold the rocker arms in place just finger tight at this time.
i. Start the two breather cover bolts at this time, but do not
tighten them.
j. Begin tightening the rocker arm bolts. Following the sequence
of lowest bolt on spark plug side, highest bolt on intake side,
lowest bolt on intake side, then highest bolt on spark plug side.
Tighten each bolt ¼ turn at a time following this sequence until
they have reached a torque of 18-22 ft-lbs.
k. Tighten the two breather cover bolts to 90-120 ft-lbs.
l. Allow lifters to bleed down, then check to ensure both pushrods
rotate freely by hand.
m. Install pushrod cover keepers.
n.Install new rocker box gasket, and rocker box top cover.
o.Apply blue threadlocker to the six rocker cover bolts and tighten
in a star pattern to 15-18 ft-lbs.
p.Repeat for the other cylinder, following steps 1 through 15.
q.Install the gas tank.
r. Shift transmission into neutral.
s. Lower motorcycle onto lift and remove jack.
t. Install spark plugs and plug wires.
u.Reconnect negative battery cable.
flange. Using the washer removed in disassembly step G, install
crankshaft gear bolt and tighten to 25 ft-lbs. torque.
P. To check backlash between the rear cam outer drive gear and
the crankshaft pinion gear, place the dial indicator on a tooth
of the rear cam outer drive gear. Rock the rear cam outer drive
gear back and forth, and record the indicated backlash. Use the
rear tire to turn the engine, and check the lash in four positions
at 90° intervals on the pinion gear. Since these measurements are
taken directly, they are correct as indicated. Do not divide by 2.
Backlash measurements for outer gears may vary depending on
the total indicated run-out (TIR) of the pinion shaft. The lowest of
the four measurements should be between .0005” and .001”, but
none should be over .002”. If backlash is not correct, pinion gear
must be replaced with either an oversized or undersized pinion
gear. These gears are not included in the cam kit. See line drawing
on page 8 for part numbers. If the lowest backlash readings are
within specification and the highest reading is over .002", the
pinion shaft of the flywheel assembly has too much run out and
must be corrected.
Q. Press a small piece of clay or kneadable putty on cam cover
mounting boss shown. See Figure 5 previous page. Carefully
hold cover and cover gasket in position against crankcase. Install
mounting bolts (4) near corners of cover finger tight. Push or tap
cam cover towards front of engine.
R. Carefully remove cam cover. Determine cover-to-gear clearance
by measuring impression left in clay by gear at its thinnest point.
Clearance should be .030" or more.
If clearance is less than .030", or if cover contacts gear, remove only
enough material from cam cover to obtain correct clearance. Repeat
steps M and N if necessary.
CAUTION
Be careful not to grind too deeply and break through to the
outside of the cam cover. Damage to cam cover caused by
removing too much material is not covered under warranty.
S. Use a new gasket and install cam cover. Tighten cover bolts to
90-120 in-lbs. torque in sequence shown. See Figure 6 above.
T. Remove clips to release lifters. If necessary, place transmission in
high gear and turn rear wheel to rotate engine until both lifters of
front cylinder are at lowest point on camshaft. The engine is now
at TDC of compression stroke for front piston. If equipped with
compression releases, you must use extra care when adjusting
pushrods. Because the decompression lobe is near TDC, it is
possible to adjust the pushrod while the tappet is on the lobe if
it is not exactly at TDC. This will cause incorrect exhaust pushrod
adjustment. To verify correct position, you can rotate the engine
in the forward direction and feel for the exhaust tappet to
slightly lift ( about .030") and set back down on base circle. This is
the proper point to adjust the pushrods.
U. Loosen locknuts on adjustable pushrods and turn adjusters to
make all rods as short as possible.
V. Longer S&S® pushrods are for exhaust valves, and shorter ones
are for intake. Pass one long and one short pushrod through
assembled pushrod covers. Place pushrod and cover assemblies
through lifter cover. Inner tappet hole is for intake pushrod, and
outer tappet hole is for exhaust pushrod. While holding a new
gasket under lifter cover, install push rod, pushrod cover, lifter
cover, and gasket as an assembly on crankcase. Tighten lifter
cover screws to 95 in-lbs. torque.
NOTE: If using unmodified original tappets, perform steps 3-A thru 3-D to
adjust pushrods, see below. If S&S HL2T kit has been installed in tappets,
proceed to steps 4-A thru 4-F. See below.
All references to Harley-Davidson® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s products are original equipment
parts or that they are equivalent to the corresponding H-D® part number shown.
7
S&S® GEAR DRIVE CAMS ASSEMBLY PARTS
1-
2-
3-
4-
5-
6-
7-
8-
9-
Gasket, Cam Cover........................................................................31-2032-S
Bearing, Needle, Inner Cam (2)................................................... 31-4080
Bearing, Outer Cam, Ball............................................................... 31-4081
Gear, Pinion Standard Diameter................................................. 33-4160
Undersized....................................................................................... 33-4160X
Double Under.............................................................................. 33-4160XX
Oversized..........................................................................................33-4160Z
Double Over..................................................................................33-4160ZZ
Gear, Cam Drive
(Includes reference #12, 13 & 16)............................................. 106-4882
Gear, Camshaft, Front
(Includes reference #15)...............................................................33-4272F
Gear, Camshaft, Rear
(Includes reference #15) Standard Diameter......................... 33-4272
Undersized................................................................................... 33-4272RX
Oversized...................................................................................... 33-4272RZ
Kit, Gear Drive Cams
(Includes reference #4-7, 12, 13, 15 & 16)................................. 33-4275
Kit, Gear Drive Cams Outer Gears
(Includes reference #4, 5, 12, 13 & 16)....................................... 33-4276
10-Kit, Chain Drive Camshaft Installation
(Includes reference #1-3, 11 & 14)............................................ 106-5896
11-Screw, HHC 5⁄16"-18 x 3⁄4".................................................................. 50-0100
12-Screw, SHC 3⁄8" -24 x 13⁄4"................................................................. 50-0132
13-Washer, Flat 3⁄8"x 11⁄8"x .225".......................................................... 50-7056
14-Ring, Retaining.................................................................................. 50-8061
15-Key, Woodruff .125 x .5 (2).........................................................50-8223-S
16-Key, Parallel, .188" x .150" x .420", Steel...................................106-1348
17- O-ring...................................................................................................50-8039
18-Camshaft Set
Set, Camshaft, 509G......................................................................330-0018
Set, Camshaft, 510G.........................................................................33-5174
Set, Camshaft, 570G.........................................................................33-5166
Set, Camshaft, 585G.........................................................................33-5168
Set, Camshaft, 625G.........................................................................33-5170
Set, Camshaft, 640G.........................................................................33-5172
Easy Start Camshaft Sets
Set, Camshaft, Easy Start, 551G.................................................106-5441
Set, Camshaft, Easy Start, 570G................................................106-5246
Set, Camshaft, Easy Start, 583G............................................... 106-5858
Set, Camshaft, Easy Start, 585G................................................106-5250
Set, Camshaft, Easy Start, 625G............................................... 106-4839
Set, Camshaft, Easy Start, 640G................................................106-5254
Set, Camshaft, Easy Start, 675G................................................106-5242
17
18
8