Both of my toilets are over-filling the tank causing continuous running water until you vigorously jiggle the handle and the float pops up shutting the water off. Both are Kohler, 7-years old and the problem just started a month or so back around the same time. If I semi-vigorously push down/pull up the float several times, it seems to help temporarily, but always goes back to the original problem where the floats are not popping up when the water reaches a certain height.
I know nothing about any of this stuff - do I need to replace the guts? I took the cap off and flushed the inside per another post, but it had no effect. There was no washer to clean - just two plastic pieces that snap together and twist.
I guess I could try replacing the guts myself but I'm afraid of doing it wrong and/or opening a whole 'nother set of problems... Any ideas? Do these floats just kind of stop working correctly over time? Any quick/permanent fix? Replace the guts? Is this a reasonable do-it-yourself job or should I get a plumber? Thanks!

What ballcock do you have? Back to you, Tom

The one on the left - 400A. Thanks - Mark

You need to adjust the wate level, see the image below holdthe clip and push it down a bit to adjustthe water level and try the water level should be adjusted to apprx.1" below the top of the overfloew tueb, good luck.

John

Hi guys!

Sorry John (Afaroo), but I'm quite sure that the issue here is NOT water level...

Mwl1320, you said, "There was no washer to clean - just two plastic pieces that snap together and twist".

Without question, there is a washer there and it sounds like that is the issue (gunk caught under the washer).

Check out this video:

XOlK7X82EUc

Post back with result, OK?

Mark