I have a Troy Bilt mower with a mulcher added on. It's been leaving many clots of grass
Behing,which causes my grass to be blocked,and I think is causing my lawn to have many brown spots.
I 'gotta figure it's the mulche,but I just don't know. The machine is 2and a half yrs old.
Thanks,
Gustavo

Mow more frequently or slower, when the grass is less wet, and sharpen the blade.

Are the blades dull, or perhaps put on upside down?