21
Fuel System
18 690 06 Rev. --
KohlerEngines.com
CARBURETOR
WARNING
Gasoline is extremely
fl
ammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings, away
from sparks or
fl
ames. Spilled fuel could ignite if it comes
in contact with hot parts or sparks from ignition. Never use
gasoline as a cleaning agent.
Explosive Fuel can cause
fi
res and severe
burns.
Do not
fi
ll fuel tank while engine is hot or
running.
These engines are equipped with a
fi
xed main jet
carburetor. Carburetor is designed to deliver correct fuel-
to-air mixture to engine under all operating conditions.
Idle mixture is set at factory and cannot be adjusted.
Troubleshooting Checklist
When engine starts hard, runs rough, or stalls at low
idle speed, check these areas before adjusting or
disassembling carburetor.
1. Make sure fuel tank is
fi
lled with clean, fresh
gasoline.
2. Make sure fuel tank cap vent is not blocked and is
operating properly.
3. Make sure fuel is reaching carburetor. This includes
checking fuel shut-off valve, fuel tank
fi
lter screen,
in-line fuel
fi
lter, fuel lines and fuel pump for
restrictions or faulty components as necessary.
4. Make sure air cleaner base and carburetor are
securely fastened to engine using gaskets in good
condition.
5. Make sure air cleaner element (including precleaner
if equipped) is clean and all air cleaner components
are fastened securely.
6. Make sure ignition system, governor system,
exhaust system, and throttle and choke controls are
operating properly.
Typical One-Barrel Carburetor Components
E
G
H
J
M
K
O
N
F
I
D
A
L
B
C
A
Idle Jet
B
Choke Shaft Assembly
C
Fuel Inlet Fitting
D
Throttle Shaft Assembly
E
Low Idle Speed
Adjusting Screw
F
Main Nozzle Tube
G
Main Jet
H
Bowl Gasket
I
Fuel Inlet Needle
J
Spring
K
Float
L
Hinge Pin
M
Fuel Bowl
N
Bowl Retaining Screw
Gasket
O
Bowl Retaining Screw
