Large air bubble when toilet flushed

SOURCE: Toto Toilet - no water flow to refill tank after flush

Remove the tank lid and look at the fill valve. Is it a yellow valve?
This fill valve is common on the Toto Toilets and can easliy plug with debrie.

They can be disassmbled and cleaned. however, I usually just replace the valve with Fluid Master Fill valve.
You will also want to check the water coming into the toilet by turning off the water that supplies the toilet and disconnecting the water supply line. After removing the water supply line turn on the water at the valve to make sure that the water is flowing properly. Check the supply line also to make sure it is not plugged.
Be sure and place a small container to catch the water that will come from the valve. A towell will also help from making too much of a mess.
If the Supply line and the valve are clear the problem is in the fill valve.
The G-Max system denotes the Flushiing system which is a 3" flapper that allows the water from the tank to flow into the bowl quicker.
Good Toilets!

sanray

SOURCE: toilet flushing

you either have the wrong flapper or it is not adjusted right try moving the chain to shorter or longer lenght the other thing to check is that your handle is not loose if you have to tighten handle be careful it is a reversed thread also check water level in tank

SOURCE: Why would a toilet emit a big bubble of air from

you mite have a cloged air vent. or if you have a septic tank it needs pumped. and a clog mite be at inlet of pipe. dig open inlet of tank pull lid, if you cant see the pipe where it enters tank, take a broom handle and stick in the opening. to see if you knock out clog. or call a septic service company,not a plumber. hope this helps. duane.

SOURCE: Toto Dorian toilet does not flush clean

Don't know if you have calcium build up problems. If you do you could pour a calcium cleaner into the tank to try and clear up the problem. This would be the only way to possibly clean the enclosed area. Good Luck. Jeff

SOURCE: American Standard Toilet does not flush except on

I would suspect some sort of air lock in the pipe, or just a partial blockage which is slowing the water flow.
You may be able to clear it using a rubber plunger. You need a plunger that has a metal or hard plastic disk fitted above the rubber cup (to prevent the cup turning inside out).
If you have an ordinary plunger without the disk you could probably make one to fit it - perhaps the bottom cut out of a plastic drinks bottle and a hose clip to hold it in place.
You will need to work the plunger quite vigorously up and down in the toilet bowl to force a pulse of water through the system.
Pouring a large bucket full of water down the toilet after plunging may have more impact than just normal flushing. It will also refill the trap.