My toilet does not fully flush. I have changed all the working parts inside the tank. What appears to be happening is the flapper does not stay open long enough to allow all of the water in the tank to drain into the bowl. I just bought a new flapper with a floating devise on the chain that supposed to keep the flapper open longer. This did not work either. The toilet flushed perfectly before I changed all the working parts in the tank. I am at a lose. Thanks for your help. Bob

With the flapper seated the linkage wants to have 1/4" of play. Too much play and the flapper doesn't get pulled back enough giving you a short flush. Too tight and it lets water seep past the flapper. I adjust the chain by the link and if it needs fine tuning, I bend the flush lever rod a bit until I have the desired play in the linkage. One more thing about a flapper. you will see where the old flapper hooks onto the base of the white overflow tube. On a older type with no hooks the flapper has a ring that slips down over the overflow tube to the seat,(see image). If your tank has hooks, take a sharp knife or scissors and cut the neoprene ring off on the marks provided and hook the flapper on the hooks. Leaving the ring on will interfere with the flush. The water level in your tank should be 3/8 to 1/2" below the top of the overflow tube when the tank's filled. And the little tube wants to run from the ballcock and connect to the white overflow tube.. Hope this helps. Tom