Carburetor Troubleshooting; Hard Starting; Stalling - Kohler 5ERKM Service Manual

3.3 Carburetor Troubleshooting

This section is for fuel-related problems and basic
carburetor troubleshooting.
carburetor component identification.
Note: When troubleshooting the fuel system, it is
important to have an adequate fuel supply.
A lean or rich fuel condition can reduce power output
and cause poor acceleration.
Symptoms of a lean condition:
D

Hard starting

D

Stalling

D
Hunting
Symptoms of a rich condition:
D
Hard starting
D
Stalling
D
Percolation
D
Flooding
D
Leaking carburetor
If a rich condition occurs, remove the air cleaner
element and observe the choke plate to ensure that it is
fully open. The choke will not fully open until the engine
is warm. If the choke does not fully open, test the
bi-metallic strip and the choke pull-off. See Figure 3-2.
Replace components as necessary.
Choke Pull-off Vacuum Solenoid Test Procedure:
1. Remove the vacuum hose that is connected to the
back of the choke pull-off vacuum solenoid.
2. Push and hold the choke linkage into the choke
pull-off vacuum solenoid.
3. Seal the vacuum port on the back of the solenoid
and release the choke linkage. If the choke linkage
moves back to the original location while the
vacuum port is sealed, replace the choke pull-off
vacuum solenoid.
6 Section 3 Fuel System
See Figure 3-2 for
Bi-metallic Strip Test Procedure:
1. Start and run the generator set until it reaches
normal operating temperature. (5--10 minutes).
2. If the choke plate lever can be rotated
counterclockwise adjust or replace the bi-metallic
strip.
3
4
1. Choke pull-off
2. Bi-metallic strip
3. Choke linkage
4. Choke plate lever
Figure 3-2 Fuel System Exploded View
3.3.1 Hard Starting
A flooded engine, an improperly adjusted or inoperative
choke, or a dirty carburetor (lean condition) can cause
hard starting.
3.3.2 Stalling
A dirty carburetor can cause stalling. Clogged idle air
bleeds, idle air passages, or an idle discharge port can
cause stalling because of a lean condition. To remedy
this condition, clean or adjust the carburetor.
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