Question about Kohler Home
Most of the time with your symptons it is either the flapper chain is too loose or you have the wrong flapper installed.
Kohler tanks take a special flapper and the generic flappers will work but not as well as the Kohler flapper designed for that tank.
The lift chain should not be tight but just slightly loose. If it is too loose, the handle travel is near the end of its' lift range before it lifts the flapper and the flapper is not lifted high enough to float long enough for enough water for a full flush to pass before it falls back on the valve seat. Wow, that was a mouthfull. Conversely if you get it too tight and the chain kinks a little the flapper may not completly seat and allow water to leak by.
The overflow tube is primarily a safety device. If the ballcock does not shut off completly the overflow tube merely allows the water to run through the bowl instead of overflowing the tank.
Depending on the model of the water-closet there could be other issues but it sounds like a simple flapper thing. Adjustment or the wrong flapper. When you get a bad flush the flapper is closing before enough water has been allowed to pass. You can always hold the handle for a few seconds and accomplish the same thing.
As far as the back-up is concerned I don't think that should be an issue but the water should not back up in the tube unless there is a restriction somewhere in the bowl waterways. I have seen many things get lodged in water-closets and it is always a possibility.
First make sure you have the right flapper and it is properly adjusted.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on Nov 14, 2010
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Posted on Jan 02, 2017
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