Carburetor Adjustment - Kohler Courage SV470 Service Manual

Section 5
Fuel System and Governor
Condition
1. Engine starts hard, runs roughly
or stalls at idle speed.
2. Engine runs rich. (Indicated
governor hunting, or excessive
governor hunting, or excessive

Carburetor Adjustment

NOTE: Carburetor adjustments should be made only
The carburetor is designed to deliver the correct
conditions. The main fuel jet is calibrated at the
factory and is not adjustable*. The idle fuel adjustment
needle is also set at the factory and normally does not
need adjustment. If the engine is hard starting or does
not operate properly, however, it may be necessary to
adjust or service the carburetor.
a special high altitude main jet. Refer to High
Altitude Operation later in this section.
5.4
Troubleshooting – Fuel System
Possible Cause/Probable Remedy
idle speed screw, then adjust the low idle fuel needle.
fuel needle.
d. Dirt under fuel inlet needle. Remove needle; clean needle and
seat and blow with compressed air.
e. Bowl vent or air bleeds plugged. Remove fuel bowl, low idle
fuel adjusting needle, and welch plugs. Clean vent, ports, and air
bleeds. Blow out all passages with compressed air.
fuel needle.
c. Idle holes plugged; dirt in fuel delivery channels. Remove fuel
bowl, low idle fuel adjusting needle, and welch plugs. Clean
main fuel jet and all passages; blow out with compressed air.
b. Dirt under fuel inlet needle. See Remedy 2d.
c. Bowl vent plugged. Remove fuel bowl and clean bowl vent. Blow
out with compressed air.
Figure 5-3. Fixed Main Jet Carburetor.
Idle Speed (RPM)
Adjustment Screw
Idle Fuel
Mixture Needle