I installed a new flapper and it doesn't stay open long enough. The chain is short to the point not much left to shorten. It was the proper flapper, but just does not stay open long enough unless I hold the handle down. When held down, it flushes just fine. I replaced flapper because old one was leaking and causing run on.
Plumbing – Toilet not flushing properly because flapper is closing too soon
plumbingtoilet
Best Answer
Sounds like the chain is too short. The flapper has to come up past vertical, so that it's out of the way for the full flush. Once the tank starts to fill again, the flapper will slam shut.
If the chain is too long, it won't lift the flapper enough. If the chain is too short, it won't let the flapper fall into the full open position. The chain has to be just right, for everything to work.