Kohler 3.5CFZ - Manual (Page 36)

TP-5695 12/93 3-8 Scheduled Maintenance
Carburetor/Choke Lubrication
The only maintenance required is to lubricate carburetor
and choke linkage at the specified interval using white
lithium grease or lubriplate.
Carburetor Adjustments
The carburetor is a single-barrel, horizontal design and
uses an electric choke.
Lack of power usually indicates that the fuel mixture is
too rich. An overrich mixture may also be caused by a
clogged air intake (backfire flame arrestor)— check this
before readjusting carburetor. Fuel mixture may be too
lean if engine skips or backfires. Minor carburetor
adjustment may be necessary to compensate for
differences in altitude, fuel, and temperature.
1. With ENGINE STOPPED, turn fuel mixture screw
in (clockwise) until it seats lightly. DO NOT
FORCE! Turn fuel mixture screw out 2 to
2 1/2 turns. See Figure 3-8.
2. Start engine and let it run at no load for about 5
minutes. Before making adjustments engine
should be thoroughly warmed up running at
governed speed, and connected to full load.
3. Turn low speed mixture screw in until engine
instability (hunting) develops and then screw out
until engine instability is again apparent. Turn
screw back in until it is positioned halfway between
the points of increasing stability. When properly
adjusted, engine will operate with steady governor
action.
4. To adjust the idle speed, run the generator set at no
load. Push the throttle lever counterclockwise until
it hits the idle speed screw. Holding the throttle
lever against the screw, adjust the idle speed screw
until unit runs at 55 Hz (3300 rpm) for 60 Hz models
or 45 Hz (2700 rpm) for 50 Hz models.
NOTE
If engine runs poorly after adjusting carburetor and
doing scheduled maintenance, return generator
set to an authorized service dealer/distributor to
have problem corrected.
WARNING
Fire.
Can cause severe injury or death.
Do not smoke or permit flame or spark to occur
near fuel or fuel system.
A sudden flash fire can cause severe injury or death.
Do not smoke or permit flame or spark to occur near fuel
system. Keep the compartment and generator set clean
and free of debris to minimize chances of fire. Wipe up
all spilled fuel and engine oil.
2
1
3
1. Governor Arm
2. Low Speed
Mixture Screw
3. Idle Speed Screw
1-829
1-829
Figure 3-8. Fuel Mixture Adjustment