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Kohler CV730S-0017 Running Rich


paulguy's Avatar
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08-24-10, 09:04 AM   #1  
Kohler CV730S-0017 Running Rich

How is it possible for an engine with no air/fuel mixture setting to run rich? The butterfly is wide open, and it used to run fine.
Any ideas?

 
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08-24-10, 11:06 AM   #2  
Posted By: paulguy How is it possible for an engine with no air/fuel mixture setting to run rich? The butterfly is wide open, and it used to run fine.
Any ideas?
They can run rich if the air filter is really dirty.

 
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08-24-10, 03:30 PM   #3  
Also from a non-seating float needle valve due to trash under it or just being worn. And, There could be a pin hole developed in the accelerator pump diaphragm....

 
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08-25-10, 01:19 PM   #4  
Accelerator pump

What exactly does an accelerator pump do?

 
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08-25-10, 02:48 PM   #5  
When the throttle control is moved from slow to fast speed it shoots a little extra fuel into the carb venturi area. This reduces stumble on throttle up.

If a pin hole develops in this diaphragm engine vacuum in the venturi can pull constant extra fuel, This can cause a rich running condition.

 
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