Kohler MAGNUM 16hp User Manual

12
Low Idle Speed
Adjusting Screw
Low Idle Fuel
Adjusting Needle
High Idle Fuel
Adjusting Needle
(Adj. Jet Carbs. Only)
Figure 8. Carburetor.
1. With the engine stopped, turn the adjusting
needle(s) in (clockwise) until it bottoms lightly.
NOTE: The tip of the idle fuel and main fuel
adjusting needles are tapered to critical
dimensions. Damage to the needles and
the seats in carburetor body will result if
the needles are forced.
2. Preliminary Settings: Turn the adjusting needles
out (counterclockwise) from lightly bottomed as
follows to the rich side of adjustment.
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 (steps 4, 5, and
6).
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
1/8 to 1/4 turn. See Figure 9 for best main fuel
performance.
Figure 9. Optimum Main Fuel Setting.
5. Low Idle Speed Setting: Place the throttle control
into the “idle” or “slow” 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.
6. Low Idle Fuel Needle Setting: Place the throttle
into the “idle” or “slow” 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 10 for best low idle fuel performance.
Walbro Fixed Jet Low Idle
MV16 1-1/4 turns
MV18 1-1/4 turns
MV20 1-1/4 turns
Walbro Adj. Low Idle Main Fuel
MV16 1-1/4 turns 1-1/4 turns
MV18 1-1/4 turns 1-1/4 turns
MV20 1-1/4 turns 1 turn
Figure 10. Optimum Low Idle Fuel Setting.
Back Out
Approx. 1/
8 to 1/4
Turn
Lean Lean
Back Out
Approx. 1/8 to
1/4 Turn
Lean Lean

Kohler MAGNUM 16hp Specifications

General

Brand	Kohler
Model	MAGNUM 16hp
Category	Engine
Language	English