Kohler Cimarron Flush

[hudson75]

Inside of the Cimarron tank.

Just finished installing Kohler Cimarron. Haven't given it any heavy duty work yet.
When I flush only half the water leaves the tank and the flapper drops immediately. If I hold the lever the tank empties. Wondering if this is normal?

[jadnashua]

That's normal for a 1.6 gallon toilet flush. They still need some pressure, so they have to have some water in the tank to make what does go out leave with some force. The flapper valves are made to close earlier than the "old" ones did, keeping the total volume of water down to the spec. Now, if you have a really big load, you can hold the lever down until it all goes out, but then you'd be using more water with each flush. If it is designed right, it shouldn't make a difference! (it should flush right by design).