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Fuel System
KohlerEngines.com 20 690 01 Rev. F
1. Place throttle control into idle or slow position. Adjust
low idle speed to 1200 RPM. Follow Low Idle Speed
(RPM) Adjustment.
2. Low idle fuel needle(s) setting: place throttle into idle
or slow position.
a. Turn 1 low idle fuel adjusting needle out
(counterclockwise) from preliminary setting until
engine speed decreases (rich). Note position of
needle. Now turn adjusting needle in (clockwise).
Engine speed may increase, then it will decrease
as needle is turned in (lean). Note position of
needle. Set adjusting needle midway between
rich and lean settings.
b. Repeat procedure on other low idle adjustment
needle (two-barrel carburetor only).
3. Recheck/adjust Low Idle Speed (RPM) to specified
setting.
High Speed (RPM) Adjustment
1. With engine running, move throttle control to fast.
2. Turn inner adjustment screw outward to decrease, or
inward to increase RPM speed. Courage singles
require loosening screws on speed control bracket
and sliding towards carburetor to lower and away
from carburetor to increase speed.
Carburetor Servicing
NOTE: Main and slow jets are fi xed and size specifi c
and can be removed if required. Fixed jets for
high altitudes are available.
● Inspect carburetor body for cracks, holes, and other
wear or damage.
● Inspect fl oat for cracks, holes, and missing or
damaged fl oat tabs. Check fl oat hinge and shaft for
wear or damage.
● Inspect fuel inlet needle and seat for wear or damage.
● Inspect spring loaded choke plate to make sure it
moves freely on shaft.
1. Perform removal procedures for appropriate air
cleaner and carburetor outlined in Disassembly.
2. Clean exterior surfaces of dirt or foreign material
before disassembling carburetor. Remove bowl
retaining screws, or solenoid assembly on most
single cylinder engines, and carefully separate fuel
bowl from carburetor. Do not damage fuel bowl
O-rings. Transfer any remaining fuel into an
approved container. Save all parts. Fuel can also be
drained prior to bowl removal by loosening/removing
bowl drain screw.
3. Remove fl oat pin (some carburetors may have a
screw which requires removal), and inlet needle.
Seat for inlet needle is not serviceable and should
not be removed.
4. Clean carburetor bowl and inlet seat areas as
required.
5. Carefully remove main jets from carburetor. For
two-barrel carburetors, note and mark jets by
location for proper reassembly. Main jets may be
size/side specifi c. After main jets are removed, on
some carburetors, main nozzles can be removed
through bottom of main towers. Note orientation/
direction of nozzles. End with 2 raised shoulders
should be out/down adjacent to main jets. Save
parts for cleaning and reuse.
6. Position of slow jet varies and is removable only on
some styles of carburetors. See correct illustration
for corresponding style of carburetor showing
location. (On two-barrel carburetors, slow jets may
be sized to specifi c side. Mark or tag jets for proper
reassembly. Note small O-ring on bottom of each
jet.) Save parts for cleaning and reuse unless a jet
kit is also being installed. Clean slow jets using
compressed air. Do not use wire or carburetor
cleaner.
Carburetor is now disassembled for appropriate cleaning
and installation of parts in overhaul kit. See instructions
provided with repair kits for more detailed information.
High Altitude Operation
Engines may require a high altitude carburetor kit to
ensure correct engine operation at altitudes above
1219 meters (4000 ft.). To obtain high altitude kit
information or to fi nd a Kohler authorized dealer visit
KohlerEngines.com or call 1-800-544-2444 (U.S. and
Canada).
This engine should be operated in its original
confi guration below 1219 meters (4000 ft.) as damage
may occur if high altitude carburetor kit is installed and
operated below 1219 meters (4000 ft.).
UNITIZED THROTTLE AND CHOKE CONTROL
Some engines are equipped with a unitized throttle and
choke control. This assembly controls choke and engine
speed with a single lever.
Throttle Cable Adjustment
Throttle/Choke Controls Details
BA
A Cold Engine B Warm Engine