Flapper closes too soon

[Redwood]

Yes!

That type uses a 3.5 gpf flapper as the plastic container exclude additional water from reaching the flush valve so the flapper will close on time.

[Stayouttadabunker]

Is this it?

[Redwood]

Is this it?

That is a 3.5 GPF Flapper...

[Weilian]

If adjusting the chain and other stock adjustments wont work try this. Quickest way to fix it on the spot without wasting time and a few dollars on a new one is to make it float longer, that's obvious. Now, how to we do that? The easiest way I could think of, that anyone could do to displace/prevent water from filling the flapper to its entirety, is to fill it with some foam/sponge, like that from your typical kitchen sponge scrub. Just cut a piece that would fill the inside of the flapper and put it in. Do not pack the flapper with too much as that would defeat the purpose. Tada... Your 1 minute quick fix.