I don't know about your toilet but i googled it and found this it's the flapper and flush valve
https://www.plumbingsupply.com/images/kohler-flush-valve-1044458.jpg
and you can go here and see all the parts in it,hope this helps you out.
https://www.plumbingsupply.com/kohlertoiletparts-cimarron.html
sorry that site i showed you you need model number for parts go here and hopefully this will help you out,https://www.youtube.com/watch?v=-oOEcjT1...
is this what your problem is hopefully it's just the gasket that's worn
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SOURCE: valve adjustment
You need to replace the flapper and you will need to purchase one specifically for the Kohler toilet. I have the same toilet and tried using a generic flapper and from experiance, it didn't work until I bought the correct one and I'm a plumber! Have a great night.
SOURCE: Running toilet
Mine does that also, here's what I found.; I am on a well and occasionaly sand gets caught in the valve thingy... Take the tank lid off, turn the arm that attaches to the float assy. 1/4 turn towards the back of the tank and take it out. Rinse off the gasket and pin as well as inside the hole. Reassemble and it should solve your problem.
SOURCE: not the float
Had a similar problem with a Wellworth after changing out all the replaceable parts. The new triangle gasket + nut kit was missing the flat anti-friction ring needed to allow the plastic nut to be hand tightened enough against the rubber gasket - without the ring the friction stops the nut turning, and you get a leak because there isn't enough pressure on the gasket. Retrieved the old ring from the trash & put it in - works perfect now! not sure if this is your problem too, but you might want to check the locknut / gasket tightness & seal.
SOURCE: Toilet Bowl Water Level Slowly Drops
Check the fill tube in your toilet one easy way to see if it's leaking is get food coloring and pour in your tank to color the water this makes it easier to see and squeeze the tube in the tank when it's full if you see the colored water running down the middle of it you have a winner! if not you can look around for it sometimes the plastic under the flapper gets cracked too
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