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3
.
4 .
5 .
Start the engine and run at hatf throttle for five to
ten minutes to warm up. The engine must be
warm before making final settings.
Main Fuel Needle Setting: This adjustment is
required only for adjustable main jet carburetors.
If the carburetor is a fixed main jet type, disregard
this setting.
Place the throttle into the Vast” position.
Turn the adjusting needle In (clockwise). The
engine speed may increase, then it will decrease
as the needle is turned in (lean). Note the
position of the needle. Back the needle out
approximately l/8 to i/4 turn. See figure below
for best main fuel performance.
6 .
Back out
Appx. 118
to 114
Lean
turn.
Lean
r
I
\
\
I
I
11
@
I
8
Optimum Main Fuel Setting.
Low Idle Fuel Needle Setting: Place the throttle
into the “idle” or %loW position.
Turn the adjusting needle in (clockwise). The
engine speed may increase, then it will decrease
as the needle is turned in (lean). Note the
position of the needle.
L
\
\
Back out
Appx. 118
to 114
Lean
turn.
Lean
CI
I
I
I
\I
@
I
{
I
I
I
v
---
c3
Optimum Low Idle Fuel Settlng.
Low Idle Speed Setting: Place the throttle
control into the “idle” or %lown position. Set the
low idle speed to 1200 RPM* (+ or - 75 RPM) by
turning the low idle speed adjusting screw In or
out.
Check the speed using a tachometer.
*NOTE:
The actual low idle speed depends on the
application. Refer to the equipment
manufacturer’s instructions for specific low
idle speed settings. To ensure best results
when setting the low idle fuel needle, the
low idle speed must not exceed 1500 RPM.
FUEL FILTER
Some engines are equipped with an in-line fuel filter.
Visually inspect the filter periodically and replace
when dirty with a genuine Kohler filter.
Back the needle out approximately i/8 to l/4 turn.
See figure below for best low idle fuel
performance.
12