S&S Cycle Super E and G Series Shorty Performance Carburetors for 1936-84 Harley-Davidson Big Twins and 1957-85 Ironhead Sportster Models - Manual (Page 10)

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adjusted too tightly, valves may not seat properly,
and the loss of compression may prevent the engine
from starting.
6- Improper idle mixture and/or engine idle rpm setting.
If idle mixture is set incorrectly, throttle plate must be
opened farther with the idle speed screw in order to
maintain idle speed. This reduces manifold vacuum
and makes the enrichment circuit less effective. See
"Adjusting Carburetor - Idle Circuit."
7- Enrichment device feed hole (See Picture 18) in bowl
plugged. Clear with compressed air.
Picture
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Do not use wire or drill to clear hole. If size of hole is changed,
starting system will be altered and carburetor bowl
irreversibly damaged.
Compressed air and particles dislodged by compressed air are
potentially harmful to eyes and body. Wear protective
goggles when using compressed air and always direct air
stream away from yourself and others nearby.
8- Improper diagnosis of rich or lean mixture condition.
If engine backfires in carb, mixture is usually lean and
engine must be reprimed. If there is no response after
three kicks or if engine pops in exhaust pipes, mixture
is probably too rich. Leave switch on and slowly open
throttle 1⁄4 turn with each successive kick until engine
fires.
9- If engine was running properly before installation of
carburetor, no other changes were made and carb
settings were confirmed as instructed previously,
hard starting is likely caused by incorrect
intermediate jet or starting routine. Remain calm and
patient while attempting to start motorcycle, and
experiment with different starting procedures
(throttle and enrichener position, number of squirts
from accelerator pump, etc.), especially with kickstart
motorcycle. Carb tuning and ignition tuning and
maintenance are critical for kick start motorcycles.
10- If severe flooding is suspected, turn ignition off,
slowly roll throttle to wide open position, and kick 6-
8 times to clear engine. Then close throttle to
approximately 1⁄8 turn, turn ignition on and kick
until engine starts.
11- If insufficient fuel is suspected, remove air cleaner
cover and confirm accelerator pump operation, with
motor off, by snapping throttle open from closed
position. Fuel should exit accelerator pump nozzle
directly behind main discharge tube in carburetor
bore.
12- If not, increase accelerator pump setting by turning
adjustment screw out, in counterclockwise
direction. Replace air cleaner cover and attempt to
start motorcycle according to procedure previously
described.
13- If more than 2-3 squirts from accelerator pump are
required to start motorcycle with temperature 60° or
above, larger intermediate jet may be required. This
may also be caused by incorrect idle mixture
adjustment or a manifold leak. Refer to following
sections for additional information on tuning.
2- Adjusting Carburetor
NOTE:
• Adjusting Idle Circuit - Idle mixture screw regulates air/fuel
mixture at idle speeds and has been angled forward for
greater accessibility. See Picture 19.
• Throttle stop/engine rpm adjustment screw is located on
boss on rear side of carburetor body. See Picture 20.
Picture
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