S&S Cycle Bore Big Twin Stroker Kit 1936–1999 3 7/16 - 3 1/2 - Manual (Page 2)

2
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.
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.
READ INSTRUCTIONS THROUGHLY BEFOR STARTING WORK.
INSTALLATION STEPS FOR FLYWHEELS BEGIN BELOW.
INSTALLATION STEPS FOR STROKER KIT BEGIN ON PAGE 12.
CAUTION
CAUTION
WARNING