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Welcome to MLF. The Kohler service manual shows a hose from the emission control to the carb. Pages 53 to 55 show the control. I don't know if your engine is equipped with this or not. That nipple in your photo seems to indicate some heat applied to that area.
Is there something wrong with the carb you have OR just curious what that nipple does. Let us know what you find.

SM_3269003_KT715_KT725_KT730_KT735_KT740_KT745_REVISED_7_15E.pdf
 

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Since it is a vapor recovery hose, I would think the pollution police have more important duties to perform. Unless the hose has the possibility of interfering with the linkage, let it hang. JMO
 
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