12
for looks with little consideration given to performance.
Most stock systems and many aftermarket ones tried
are too restrictive for good performance. Harley-
Davidson does offer a series of mufflers that can be
used with stock header pipes. These work very well in
most situations and offer an inexpensive alternative to
a new exhaust system. We prefer their tapered and
baloney cut styles.
Gearing Note
●
Gearing depends on total weight of machine and
rider/s, size of engine, caming, exhaust system and
type of riding to be done. Most strokers are capable of
pulling more gear. We suggest you break engine in
with stock gearing to minimize lugging engine. After
engine is broken in you will have a better feel of its
potential and can change gearing accordingly.
●
For those who wish to determine their final drive gear
ratio the formula is as follows:
Engine Revolutions Per One Revolution of Rear Wheel =
(Clutch sprocket*) x (Rear Wheel Sprocket*)
(Motor Sprocket* x (Transmission Sprocket*)
* Number of teeth on each sprocket
Break-In Procedure
NOTE - These engines must be broken in. They will
feel extremely strong, but resist the impulse to turn it
on. Break it in properly.
CAUTION - Lugging or running engine prematurely
at high rpms may result in damage to pistons and/
or other engine components. S&S voids its
guarantee if engine is not broken in properly.
Break engine in using following procedure:
A. On initial engine startup, don’t just sit and idle
motor while you admire your work, or tinker with
minor adjustments. Heat buildup can be
excessive.
B. First 50 miles are most critical for new rings
and piston break-in. Most engine damage will
initially occur during this period. Keep heat
down by not exceeding 2500 rpm. Vary speed.
Do not lug engine.
C. Next 500 miles should be spent running engine
no faster than 3500 rpm or about 50-55 mph.
Do not lug engine and continue to vary speed.
D. For balance of first 1000 miles, speed can be
run up to 60 to 70. Continue to run engine at
all different speeds including lower 40-45 mph
ranges.
E. 1000 to 2000 miles—basically same
procedures as before. You can be a little more
liberal with rpm range. Avoid overheating
engine and putting any hard strain on it (drag
racing, trailer towing, sidecar operation).
F. 2000 miles and up—have fun!
STROKER POWER!
(16 paginas)
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