S&S Cycle General Flywheel - Manual (Page 2)

PRESENT S&S ® CRANKCASES AND FLYWHEELS ARE NOT
COMPATIBLE WITH HARLEY-DAVIDSON ® ELECTRONIC FUEL
INJECTION (EFI) MODELS.
NOTES
●
All current production S&S flywheels are made from closed
die, heat treated, steel forgings. They do not have
connecting rod thrust washers like earlier S&S or stock
flywheels, because present flywheel material is harder than
thrust washers previously used.
● S&S big twin flywheels have three timing marks, "F", "R"
and "TF". The "F” mark stands for front cylinder 35° before
top dead center (TDC). The "R” mark is rear cylinder 35°
before TDC. The “TF” mark is TDC front cylinder.
● S&S ironhead Sportster ® model flywheels have three
timing marks, "F", "R" and "TF". The "F” mark stands for
front cylinder 40° before top dead center (TDC). The "R”
mark is rear cylinder 40° before TDC. The “TF” mark is TDC
front cylinder.
● S&S Harley-Davidson ® Sportster ® model flywheels have three
timing marks, "F", "R" and "TF". The "F” mark stands for
front cylinder 30° before top dead center (TDC). The "R”
mark is rear cylinder 30° before TDC. The “TF” mark is TDC
front cylinder. S&S Sportster
® model flywheels have timing
marks on both flywheels to accommodate four speed and
five speed engines.
● We recommend that "big inch" Evolution ® engines be timed
at 30-32° before TDC rather than the stock 35° for big twins
or 40° for Sportster
® models. When "F" timing mark is
located in the center of the timing hole, the crankshaft is
positioned 30° before TDC for Sportster
® models or 35°
before TDC for big twins for the front cylinder. When "R"
timing mark is located in the center of the timing hole, the
crankshaft is positioned 30° before TDC for Sportster
®
models or 35° before TDC for big twins for the rear cylinder.
Placing the mark to the rear of the hole, or just entering the
hole, advances timing almost 5°. Conversely, if the mark is
just leaving the hole, timing is retarded almost 5°.
● Usually S&S flywheels are balanced before leaving our
facility. Some customers prefer to do their own balancing or
to have another balancing shop do the work for them. This
is acceptable in most cases. However, we have had some bad
experiences with dynamically balanced flywheels that have
forced us to void our warranty if flywheels have been
balanced in this fashion.
Flywheels assembled improperly prior to being dynamically
balanced may sustain irreversible damage to mainshaft and
crankpin tapers during actual balancing. S&S voids its
guarantee if flywheels have been balanced in this fashion.
● Many problems in assembling and truing flywheels can
be prevented by careful inspection of all parts used in
the assembly.
● Cleaning parts prior to and during assembly and keeping
parts clean after final assembly are imperative to minimize
contaminants that may circulate in oil and shorten engine
life. Many parts can be cleaned with soap and water first.
Then, reclean all internal parts and gasket mating surfaces
using high quality solvent that does not leave any harmful
residues. Be sure to read and follow manufacturer's
instruction label before use. Use drills and compressed air to
clean all oil passageways of dirt, filings, etc. whenever
possible. During actual final assembly, recoat all internal
parts with high quality engine oil or assembly lube.
Manufacturing chips, dirt and/or other contaminants
circulating in engine oil may possibly damage engine
components resulting in shorter engine life and possible
engine failure.
● Some solvents, degreasers, gasoline and other chemicals
are harmful to skin, eyes and other body parts. 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.
● S&S pinion shafts for Evolution ® Sportster ® models are
the 1987 style splined shaft because this design is
stronger than the later style stock straight shaft and key.
As a result, the engine builder must use a 1986-1987
style pinion gear (H-D
® #24055-86 through #24061-86)
and oil pump drive gear (H-D ® #26318-75). Stock
Torrington style pinion main bearing in 1986 crankcases
must be replaced with 1987 and later style race and steel
caged roller bearing.
2
CAUTION
CAUTION
WARNING
All reference 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.