Kohler Comand Pro CH1000, Service Manual

Page: 33 / 142

5.3
Section 5
Fuel System and Governor
5
Figure 5-3. Keihin Two-Barrel Carburetor.
Troubleshooting Checklist
When the engine starts hard, runs roughly, or stalls
at low idle speed, check the following areas before
adjusting or disassembling the carburetor.
• Make sure the fuel tank is fi lled with clean, fresh
gasoline.
• Make sure the fuel tank cap vent is not blocked
and that it is operating properly.
• Make sure fuel is reaching the carburetor. This
includes checking the fuel shut-o ff valve, fuel
tank fi lter screen, in-line fuel fi lter, fuel lines and
fuel pump for restrictions or faulty components
as necessary.
• Make sure the air cleaner base and carburetor are
securely fastened to the engine using gaskets in
good condition.
• Make sure the air cleaner element (including
precleaner if equipped) is clean and all air cleaner
components are fastened securely.
• Make sure the ignition system, governor system,
exhaust system, and thro tt le and choke controls
are operating properly.
If the engine is hard-starting, runs roughly, or stalls at
low idle speed, it may be necessary to adjust or service
the carburetor.
Figure 5-2. Optional Electric Fuel Pump.
Fuel Pump - Replacement
Replacing the Mechanical Fuel Pump
The mechanical fuel pump is an integral part of the
valve cover assembly and not serviced separately. See
Figure 5-1.
1. Disconnect the fuel lines from the inlet and outlet
fi tt ings. Note orientation.
2. Follow the procedure for replacing the valve
cover (see Sections 8 and 10).
3. Reconnect the fuel lines to the inlet and outlet
fi tt ings and secure with the clamps.
Carburetor
General
Engines in this series are equipped with a Keihin
BK two-barrel, side-dra
ft carburetor with fi xed main
jets on a matching intake manifold. The carburetor
features a self-relieving choke, serviceable slow jets,
main jets, bowl drain and a fuel shutdown solenoid.
See Figure 5-3.
WARNING: Explosive Fuel
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. Do not fi ll the fuel tank while the engine is hot or
running, since spilled fuel could ignite if it comes in contact
with hot parts or sparks from ignition. Do not start the
engine near spilled fuel. Never use gasoline as a cleaning
agent.
Self-Relieving
Choke
Fuel Shut-Off
Solenoid
Slow Jets
Bowl Vent
Low Idle Fuel
Adjustments
(With Limiters)