Carburetor Adjustments; Carburetor Servicing; Float Setting (Keihin Only) - Kohler KT715 Service Manual

7000 series

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Service manual (85 pages)

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Carburetor Adjustments

NOTE: Carburetor adjustments should be made only

after engine has warmed up.

Carburetor is designed to deliver correct fuel-to-air

mixture to engine under all operating conditions. Main

fuel jet is calibrated at factory and is not adjustable. Idle

fuel adjusting needles are also set at factory and are not

adjustable.

Idle Speed (RPM) Adjustment

1. Hold governor lever away from carburetor so throttle

lever is against idle speed (RPM) adjustment screw

of carburetor. Start engine and allow to warm up,

then adjust screw to set approximately 1450 RPM.

Check speed using a tachometer. Turn adjustment

screw (inner) clockwise (in) to increase or

counterclockwise (out) to decrease speed.

2. Release governor lever and check that throttle lever

is in idle position. Obtain equipment manufacturer's

recommended idle speed (1750 RPM). All engines

have a bendable tab that is used to set this speed. A

pliers should be used to bend this tab to achieve

recommended speed. Governed idle speed (RPM) is

typically 300 RPM (approximate) higher than low idle

speed.

3. Move throttle lever to wide-open/full throttle position

and hold in this position. Turn high speed screw to

obtain intended high speed no-load RPM. Governed

idle speed must be set before making this

adjustment.

High Speed (RPM) Adjustment

1. With engine running, move throttle control to fast.

2. Turn inner adjustment screw outward to decrease, or

inward to increase RPM speed.

Carburetor Servicing

Accidental Starts can cause severe injury or

death.

Disconnect and ground spark plug lead(s)

before servicing.

Before working on engine or equipment, disable

engine as follows: 1) Disconnect spark plug lead(s). 2)

Disconnect negative (–) battery cable from battery.

NOTE: Main and slow jets are ﬁ xed and size speciﬁ c

and can be removed if required. Fixed jets for

high altitudes are available.

● Inspect carburetor body for cracks, holes, and other

wear or damage.

● Inspect ﬂ oat for cracks, holes, and missing or

damaged ﬂ oat tabs. Check ﬂ oat hinge and shaft for

wear or damage.

● Inspect fuel inlet needle and seat for wear or damage.

● Inspect spring loaded choke plate to make sure it

moves freely on shaft.

32 690 03 Rev. --

WARNING

KohlerEngines.com

Float Setting (Keihin Only)

12 mm (0.472 in.)

NOTE: Inlet needle center pin is spring loaded. Make

sure ﬂ oat assembly rests against fuel inlet

needle, without depressing center pin.

1. Perform removal procedures for appropriate air

cleaner and carburetor outlined in Disassembly.

2. Clean exterior surfaces of dirt or foreign material

before disassembling carburetor. Remove bowl

retaining screws, or solenoid assembly, and carefully

separate fuel bowl from carburetor. Do not damage

fuel bowl O-rings. Transfer any remaining fuel into

an approved container. Save all parts.

3. Remove ﬂ oat pin (some carburetors may have a

screw which requires removal), and inlet needle.

Seat for inlet needle is not serviceable and should

not be removed.

4. Remove two screws securing top cover, gasket, and

ground lead (Keihin carburetors only). Discard

gasket and screws only.

5. Remove idle speed adjusting screw and spring from

carburetor. Discard parts.

6. Clean carburetor bowl and inlet seat areas as

required.

7. Carefully remove main jet from carburetor. After

main jet is removed, on some carburetors, main

nozzle can be removed through bottom of main

tower. Note orientation/direction of nozzle. Save

parts for cleaning and reuse.

8. Position of slow jet varies and is removable only on

some styles of carburetors. See correct illustration

for corresponding style of carburetor showing

location. Save parts for cleaning and reuse unless a

jet kit is also being installed. Clean slow jet using

compressed air. Do not use wire or carburetor

cleaner.

9. Carburetor is now disassembled for appropriate

cleaning and installation of parts in overhaul kit.

Further disassembly is not necessary. Throttle shaft

assembly, fuel inlet seat and idle fuel adjustment

screw are non-serviceable items and should not be

removed. Choke shaft assembly is serviceable,

however it should not be removed unless a choke

repair kit will be installed.

Fuel System

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Questions and answers

Craig Aparo

February 27, 2025

Hello and Thank you for this service. I **** trying to lower the lowest rpm. With the throttle at it's lowest setting it idles very close to a normal operating speed. Which is bad for people who want to mow with out the engine revving at close to maximum rpm. Any comments would be appreciated.

2 comments:

Mr. Anderson

February 27, 2025

To lower the idle RPM on a Kohler KT715 engine, follow these steps:

1. Start the engine and allow it to warm up.
2. Locate the idle speed adjustment screw on the carburetor.
3. Use a tachometer to check the current RPM.
4. Turn the inner adjustment screw counterclockwise (out) to decrease the idle speed.
5. Release the governor lever and ensure the throttle lever is in the idle position.
6. Verify the idle speed matches the equipment manufacturer’s recommended setting (typically 1750 RPM).
7. If further adjustment is needed, use pliers to bend the 12 mm (0.472 in.) tab to fine-tune the speed.

Ensure the governed idle speed is approximately 300 RPM higher than the low idle speed.

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