from S&S...
a. Warm engine to operating temperature.
b. Accelerate rapidly through gears noting how
quickly and smoothly engine reaches rpm
level where pull of engine begins to fade and
gear shift occurs.
c. If engine backfires in carburetor and sputters
or “breaks up” and/or dies during
acceleration, increase or richen main jet size
.004" larger and road test again. Note
engine smoothness and how easily engine
reaches rpm where gear shift occurs.
d. If engine runs flat and sluggish or “blubbers”
or will not take throttle, decrease or lean main
jet size .004" smaller and road test again.
Note engine smoothness and how easily
engine reaches rpm where gear shift occurs.
e. Continue changing main jets until jet which
makes engine accelerate or rpm through
gears quickest and smoothest is identified.
S&S’s experience is that jetting about .006"
smaller (leaner) than correct will make engine
break up and quit. Jetting about .006" larger
(richer) will make engine blubber and miss.
Troubleshooting Tips for Intermediate and High
Speeds - Engine will not run at steady speed or rpm
or quits for no apparent reason:
1. Restriction in fuel supply system - Gas tank vent
plugged, needle and seat not working properly
(See “General Information”), gas petcock too
small, or defective vacuum petcock. Stock H-D
petcock is generally adequate, but may require
running on reserve to provide sufficient fuel for
big inch engines. If fuel delivery to carb is
questionable, S&S recommends Pingel brand
high flow petcock.
2. Faulty ignition/electrical system - Fouled plugs,
worn points or condenser, defective coil or solid
state module, improper ignition timing, loose
wire, faulty circuit breaker or ignition switch.
Many ignition/electrical problems occur
repeatedly at same rpm because of vibration
specific to that rpm .
3. Incorrect intermediate and/or high speed jetting.
See “Adjusting Carb - Intermediate System” and
“High Speed Circuit or Main Jet”.
4. Foreign material in air or gas passageway in carb
causing flow restriction. Picture 42 shows
intermediate air bleed metering hole. Picture 45
shows main discharge air bleed metering hole.
Use compressed air to clear holes.
good luck man
