S&S SH Series - Fuel Requirements; Break-In Procedure

5
OWNERS MANUAL — S&S® KN, P, AND SH-SERIES ENGINES
FUEL REQUIREMENTS
The gasoline used in your engine should have a US octane rating of
91. The United States uses the
method of octane rating. In many
countries outside the United States, the RON (Research Octane
Number) is used, which will result in a higher octane requirement of
about 96.
GENERAL BREAKIN NOTES
• Remember that these are air-cooled engines. Sucient air movement
is required to keep engine temperatures within safe operating limits.
• Avoid heavy trac and congestion or extended idle periods whenever
possible.
• S&S v-twin performance engines are designed for, and happiest when
running between 2750-3500 at normal highway speeds.
• Today’s heavier bikes and taller gearing can easily push a high
performance engine into a lugging condition which increases loads
on engine components, causes detonation, builds excessive heat and
increases fuel consumption. If the engine does not accelerate easily
when given some throttle, downshift to a lower gear.
• S&S engines benet from a warm-up period any time they are started,
to get to operating temperature before being subjected to heavy
loads or quick throttle revs.
BREAKIN OIL CONSIDERATIONS.
Either petroleum or synthetic oil designed for air-cooled v-twin
engines can be used during the break-in period and during normal use.
If preferred, petroleum oil can be used for the break-in period, after
which, the engine can be changed over to synthetic oil.
BREAKIN PROCEDURE
1. Initial start up. Run engine approximately one minute at 1250-
1750 RPM. DO NOT crack throttle or subject to any loads during
this period as head gaskets are susceptible to failure at this time.
During this time, check to see that oil pressure is normal, that oil is
returning the oil tank, and that no leaks exist.
2. Shut o engine and thoroughly check for any leaks or other
problems. Let engine cool to the touch.
3. After engine has cooled, start up again and allow the motor to
build some heat. Engine should be run no longer than three to
four minutes. When the cylinders become warm/hot to the touch
(approximately 150°F) shut the motor down and let it cool to room
temp. Follow the same cautions as for the initial start-up, and
continue to check for problems.
4. First 50 Miles:
a. Street: Ride normally, do not lug the engine. Avoid high
heat conditions and vary the RPM while riding. No stop and
go trac, extended idle periods, or high load or high RPM
conditions. Max of 3,500 RPM or 60 MPH.
b. Dyno: A chassis dynamometer can be used to put the rst 50
miles on a new engine. See the notes and procedure below
for chassis dyno break-in.