S&S Cycle Connecting Rods - Manual (Page 2)

S&S ® connecting rods are stronger than stock and most other
types of rods because:
1.
S&S rods have wider I-beams, heavier radiuses in critical
areas, and extra gusseting.
2. S&S heavy duty and SUPREME 34-7900 rods are forged from
4140 chrome moly steel. All other SUPREME rods are forged
from 4130EQ chrome moly steel.
3. S&S rods are heat treated to harder specifications.
4. S&S rods are shot peened.
IMPORTANT NOTES
●
S&S SUPREME rods require additional clearancing in all stock
flywheel assemblies, and stock cases when most stroker kits
are installed. It is the responsibility of the motor builder to
check for any interference in all applications.
● Whenever clearancing is performed during any installation
checks, follow recommended procedures only. Remove
material only from specified areas.
● Thoroughly inspect, debur and clean all parts before
final assembly. Blow air through oil passageways to
check for blockages.
● Read manufacturer's instruction label before using solvents
or degreasers when cleaning and assembling parts.
● Any modification performed to S&S rods other than
those specified in these instructions voids any and all
S&S warranties.
Failure to follow recommended clearancing procedures and to
use recommended clearances may cause damage to rods
and/or other engine components.
● Unwarranted connecting rod clearancing may weaken a
connecting rod possibly causing it to break. A broken
connecting rod may cause the engine to stop suddenly
without warning during operation possibly causing loss of
control of motorcycle and personal injury to you or others.
● Some solvents, degreasers, and other chemicals are toxic
and/or harmful to skin and eyes. Many items are
flammable and present a fire hazard. Read manufacturer's
instruction label for proper use. Use in well ventilated area
and wear protective clothing when using them to avoid
personal injury.
● Compressed air and particles dislodged by compressed air
are harmful to eyes and body. Wear protective goggles
when using compressed air and always direct air stream
away from body parts such as hands and eyes. Never direct
compressed air toward other people.
Flywheel Balance
All S&S rods, because of their beefier construction, weigh more
than comparable stock types. Therefore, it is recommended to
check and rebalance flywheels when replacing other rods with
S&S types.
Flywheel and Crankcase Clearancing
Due to increased front to rear I-beam width, crankpin end bulk,
and gusseting of S&S rods, additional rod to flywheel and rod to
crankcase clearancing will be required. Prior to flywheel
rebalancing and final assembly, each flywheel must be mocked
up with mainshaft and rods to check clearances. Places to note
for contact are:
1.
Female rod crankpin end to mainshaft nuts - .030" minimum
clearance recommended.
A. Install sprocket shaft and crankpin in driveside flywheel.
Snug nuts only. Do not torque to final specs.
B. Slide connecting rods and bearings over crankpin.
C. Rotate rods on crankpin, and observe clearance
between rod and sprocket shaft nut.
D. If additional clearance is needed, remove material from
sprocket shaft nut. Do not remove material from
connecting rod.
E. Repeat procedure for camside flywheel and pinion shaft.
2. Female rod crankpin end to inner flywheel rim - .060"
clearance recommended.
A. While checking female rod to mainshaft clearance,
observe clearance between crankpin end of female rod
and rim of both flywheels.
B. If additional clearance is required, remove material from
flywheel at point of contact. Do not remove material
from connecting rod.
3. Wristpin end of both female and male rods to flywheel edge
- .060" minimum clearance recommended.
A. While checking female rod to mainshaft clearance,
observe clearance between wristpin end of both rods
and rim of both flywheels.
B. If additional clearance is required, remove material from
flywheel at point of contact. Do not remove material
from connecting rod.
4. Wristpin end to crankcase and cylinder - .060" is
recommended in these areas.
A. With the camside flywheel and rods mocked up, install
the assembly in the right crankcase half with pistons
(less rings) and cylinders in place.
B. Rotate flywheel through one full revolution and check
for rod to crankcase and cylinder spigot contact on both
the front and rear of each cylinder.
C. File or grind crankcase or cylinder spigot as needed to
achieve .060" clearance. Do not remove more material
than needed.
D. Repeat for left crankcase half.
NOTE: Whenever clearancing is performed in any of these areas,
do not remove any material from the connecting rods as
clearancing on the rods may unnecessarily weaken them. Make
adjustments to the point of contact on the mainshaft nut,
flywheel rim, crankcase, cylinder spigot, etc.
Connecting rods weakened by clearancing may fail causing
serious engine damage.
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CAUTION
WARNING
CAUTION