Kohler MAGNUM 8 HP Owner's Manual page 12

2. Preliminary Settings: Turn the adjusting
needle(s) out (counterclockwise) from lightly
bottomed as follows or to the rich side of
adjustment.
Walbro Fixed Jet
L o w Idle
2-1/2 turns
1 -1/4 turns
I f
1 turn
Walbro Adjustable Jet
L o w Idle Main Idle
2-1/2 turns 3/4 turn
f
1 -3/4 turns 1 -1/8 7/8 turn turns
2 turns
3. Start the engine and run at half throttle for five to
ten minutes to warm up. The engine must be
warm before making final settings.
4. 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 "fast" 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
1/4 turn. See Figure 10 for best main fuel
performance.
Back Out Approx, 1/4 Turn
Lean
igure 10, Optimum Main Fuel Setting,
5. L o w Idle Fuel Needle Setting: Place the throttle
into the "id1e"or "s1ow"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 1/8 to 1/4 turn.
See Figure 11 for best low idle fuel performance.
Back Out Approx,
1/8 to 1/4 Turn
Lean Lean
Figure 11. Optimum L o w Idle Fuel Setting.
6. L o w Idle Speed Setting: Place the throttle control
into the "id1e"or "s1ow"position. Set the low idle
speed to 1200 RPM* (* 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.
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