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Kohler CV15S Carburetor
Kohler CV15S - Walbro Carburetor Adjustment
Kohler CV15S engines are equipped with fixed main jet Walbro
carburetors. Walbro carburetors have a low idle speed screw and a low
idle fuel adjusting needle.
Carburetor adjustments should be made only after the engine has warmed
up. The carburetor is designed to deliver the correct fuel to air
mixture to the engine under all operating conditions. The main fuel jet
is calibrated at the factory and is not adjustable.
The idle fuel adjusting needle is also set at the factory and normally
does not need adjustment. Engines operating at altitudes above
approximately 1830 m (6000 ft.) may require a special high altitude main
jet. If, however, the engine is hard-starting or does not operate
properly, it may be necessary to adjust or service the carburetor.
Engines may have a fixed idle or limiter cap on the idle fuel adjusting
needle. Step 2 can only be performed within the limits allowed by the
cap.
1) Start the engine and run at half throttle for 5 to 10 minutes to warm
up. The engine must be warm before doing step 2.
2) Low Idle Fuel Needle Setting: Place the throttle into the idle or
slow position. Turn the low idle fuel adjusting needle out
(counterclockwise) from the preliminary setting until engine speed
decreases (rich). Note the position of the needle. Now turn the
adjusting needle in (clockwise).
The engine speed may increase, then it will decrease as the needle is
turned in (lean). Note the position of the needle. Set the adjusting
needle midway between the rich and lean settings.
Kohler CV15S - Walbro Carburetor Disassembly
Remove the bowl retaining screw, retaining screw gasket, and fuel bowl.
Remove the bowl gasket, float shaft, float, and fuel inlet needle.
Remove the low idle speed screw and spring. If there is a low fuel
adjusting needle without a limiter cap, remove the needle and spring.
Do not attempt to remove the needle if it has a limiter cap. Further
disassembly to remove the welch plugs, main fuel jet, fuel inlet seat,
throttle plate and shaft, and choke plate and shaft is recommended only
if these parts are to be cleaned or replaced.
Welch Plug Removal
- In order to clean the idle ports and bowl vent thoroughly, remove the
welch plugs covering these areas.
- Use Tool and the following procedure to remove the welch plugs.
- Pierce the welch plug with the tip of the tool.
- To prevent damage to the carburetor, do not allow the tool to strike
the carburetor body.
- Pry out the welch plug with the tip of the tool.
Main Fuel Jet Removal
The main jet on Walbro carburetors is pressed into the side of the tower
portion of the body. Removal is not recommended, unless a high-altitude
kit is being installed, in which case the removal instructions will be
included in the kit.
Fuel Inlet Seat Removal
The fuel inlet seat is pressed into the carburetor body, do not attempt
to remove it. If necessary, clean it in place with aerosol carburetor
cleaner.
Choke Shaft Removal (Non-Self-Relieving)
Because the edges of the choke plate are beveled, mark the choke plate
and carburetor body to ensure correct reassembly. Also take note of the
choke plate position in bore, and the position of the choke lever and
choke return spring.
Some carburetors have the choke plate inserted into a slot in the choke
shaft. Grasp the choke plate with a pliers and pull it out of the slot.
Other carburetors will have the choke plate fastened to the shaft with
screws. Carefully remove the screws and separate the plate from the
shaft. Use a fine-toothed file to remove any burrs from the shaft.
Remove the choke shaft and choke return spring.
Throttle Shaft Removal
Do not attempt to remove the throttle shaft, as repair kits are not
available. Throttle shaft wear is normally accompanied by corresponding
wear to the carburetor body, making it impractical to attempt a
cost-effective repair. Replace the entire carburetor if the throttle
shaft is worn.
Kohler CV15S - Walbro Carburetor Inspection
- Carefully inspect all components and replace those that are worn or
damaged.
- Inspect the carburetor body for cracks, holes, and other wear or
damage.
- Inspect the float for cracks, holes, and missing or damaged float
tabs.
- Check the float hinge and pin for wear or damage.
- Inspect the fuel inlet needle and seat for wear or damage.
- Inspect the tip of the low idle fuel adjusting needle for wear or
grooves.
- Inspect the throttle and choke shaft and plate assemblies for wear or
excessive play.
Kohler CV15S - Walbro Carburetor Reassembly
Choke Shaft Installation (Non-Self-Relieving)
- Install the choke return spring to the choke shaft.
- Insert the choke shaft with return spring into the carburetor body.
- Rotate the choke lever approximately 1/2 turn counterclockwise.
- Make sure the choke return spring hooks on the carburetor body.
- Position the choke plate as marked during disassembly.
- Insert the choke plate into the slot in the choke shaft.
- Make sure the choke shaft is locked between the tabs on the choke
plate.
- If the choke plate was attached with screws, loosely attach the plate
to the shaft.
- Close the choke and center the choke plate in the bore.
- Tighten, but do not over-tighten the screws.
- Check that the choke moves freely and that the plate does not bind in
the bore.
Welch Plug Installation
- Position the carburetor body with the welch plug cavities to the top.
- Place a new welch plug into the cavity with the raised surface up.
- Use the end of the tool that is about the same size as the plug and
flatten the plug.
- Do not force the plug below the surface of the cavity.
- After the plugs are installed, seal them with Glyptal (or an
equivalent sealant). Allow the sealant to dry.
- If a commercial sealant is not available, fingernail polish can be
used.
High Altitude Operation
When operating the engine at altitudes of 1830 m (6000 ft.) and above,
the main fuel mixture tends to get overrich. An overrich mixture can
cause conditions such as black, sooty exhaust smoke, misfiring, loss of
speed and power, poor fuel economy, and poor or slow governor response.
To compensate for the effects of high altitude, a special high altitude main fuel jet can be installed. High altitude jets are sold in kits which include the jet and necessary gaskets. Refer to the Parts Manual for the engine being serviced for the correct kit number.
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KOHLER ENGINES SPECS AND SERVICE DATA |
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KAWASAKI ENGINES SPECS AND SERVICE DATA |
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BRIGGS AND STRATTON ENGINES SPECIFICATIONS |
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HONDA ENGINES SPECS AND SERVICE DATA |
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