Kohler CH680

Install Fuel Pump
WARNING
Explosive Fuel can cause fi res and severe
burns.
Do not fi ll fuel tank while engine is hot or
running.
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.
NOTE: Pulse style fuel pumps may be made of metal or
plastic. If a new fuel pump is being installed,
make sure orientation of new pump is consistent
with removed pump. Internal damage may occur
if installed incorrectly.
1. Install pulse style fuel pump and lines as an
assembly. Connect pulse line to crankcase vacuum
fi tting or valve cover, whichever source is used.
NOTE: On engines equipped with eChoke
TM
, 1 fuel
pump screw also secures a wire clip with idle
adjustment cable.
2. Install fuel pump using screws. Torque screws to
2.3 N·m (20 in. lb.).
Install Carburetor
WARNING
Explosive Fuel can cause fi res and severe
burns.
Do not fi ll fuel tank while engine is hot or
running.
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.
One-Barrel Keihin Carburetor Models
1. Install a new carburetor gasket. Make sure all holes
align and are open.
2. Install carburetor, throttle linkage and governor lever
as an assembly. If a plastic intake manifold is used
and carburetor is equipped with a fuel solenoid,
attach ground lead to carburetor mounting screw.
3. Torque carburetor mounting screws to
6.2-7.3 N·m (55-65 in. lb.).
4. If equipped with eChoke
™
, connect stepper motor
connector to wiring harness. Install wire through
nylon tie strap and secure in #1 inner baffl e.
One-Barrel Nikki Carburetor Models
1. Install a new carburetor gasket. Make sure all holes
align and are open.
2. If mechanical governor, install carburetor and control
assembly, throttle linkage and governor lever as an
assembly.
If electronic governor, install carburetor with
linkages.
3. Torque carburetor mounting screws to
6.2-7.3 N·m (55-65 in. lb.).
4. If mechanical governor, mount main control bracket
to cylinder heads using 4 screws. Torque screws to
10.7 N·m (95 in. lb.) into new holes, or 7.3 N·m (65
in. lb.) into used holes.
5. If equipped with fuel shut-off solenoid, hold solenoid
red bullet connector and reconnect lead to wiring
harness.
6. Reconnect fuel line to carburetor inlet fi tting and
position clamp to secure. Reconnect breather hose
to adapter fi tting and position clamp to secure.
7. If equipped with eChoke
™
, connect stepper motor
connector to wiring harness. Install wire through
nylon tie strap and secure in #1 inner baffl e.
8. If electronic governor, connect wiring harness
connector to stepper motor. Install wire through
nylon tie strap and secure to oil sentry lead.
Two-Barrel Keihin Carburetor Models
1. Use a new carburetor gasket. Make sure all holes
align and are open.
2. Apply Loctite
®
242
®
to shorter (inner) set of threads
of any removed studs.
3. Assemble carburetor gasket and carburetor to intake
manifold, and start any removed studs. Use two
fl ange nuts locked fl ange to fl ange and tighten each
stud until bottomed/tight.
4. Connect ground lead and fuel solenoid lead as
equipped.
Reassembly
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