Stalling engine

Old 06-01-03, 01:54 AM
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Stalling engine

I am restoring an older International Golf Cart W/ a Kohler 7 hp 4 cycle engine. The prob is, after it is running for awhile, it will stall and bog down unless I hold the choke 1/2 closed. I would think it should run w/ choke wide open after it is warmed up. Anyone have an Idea what could be causing this?
Old 06-01-03, 07:22 AM
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Hello and Welcome Al to the Do-It-Yourself Web Site and the Small Engine forum.

Engine stalling and dying under a load or after it is warmed up and the choke has to be used to restrict some of the intake air flow can be caused by several incorrect conditions.

The most likely cause is a gummed up carb. Other possibilities could be a fuel restriction in the fuel delivery system, a plugged vent hole in the fuel cap or the vent hole in the carb body is plugged up.

Try this test first:
Remove the fuel tanks gas cap and try running the engine again. If the engine runs continuously, does so with out the choke being used, the vent hole in the fuel cap is plugged.

If this is the case, carefully remove the cover inside the cap, clear the tiny hole but DO NOT enlarge it.

If that's not the problem and the engine still fails to run properly with the fuel cap off the tank, check the fuel delivery supply from the tank to the carb. Remove the fuel hose from the carb.

The fuel should flow out continuously with the cap off the tank. If fuel does not run out of the fuel hose with the cap off the tank, there is a fuel restriction in the supply. Clear the fuel restriction.

The fuel restriction could be a restriction from inside the tank or in the fuel hose. A plugged fuel filter in the fuel hose or inside the tank. Some engines may have a fuel shut off valve which may alos be restricted or partially closed, etc, if equipped with one.

The carb body also has a tiny vent hole some where on it. Locate the hole near the top or on the top of the carb and clear it but DO NOT enlarge it. Use a tiny pin if needed or a very thin piece of wire, etc. Wire from a pipe cleaner works as well as a piece of wire from a common wire brush.

If all the above fail to disclose the problem, carefully remove the carb. Note where and how the links and rods are attached to the carb b-4 you actually begin to remove it!

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