Lazy Flush

Hi All,

New here and have an issue with my toilet. I noticed all of a sudden a lazy flush occuring so I did all of the basic test...Adjusting flapper, checking fill line, adjusting the ball..

Here is the kicker...

After minor adjustments to ball and water level fill I have tested/flushed the toilet with the tank lid off, I get a nice strong flush and correct water fill, but once I put the tank lid back on...Lazy flush all over again.

I have checked for clearence to make sure nothing is touching and so forth but I cannot figure this one out.

Help??

Check the trip lever. It may be hitting the cover before it lifts the flapper high enough to maintain a good flush. IF so, shorten the chain on the flapper.