possibly a lot of carbon build up in the combustion chamber but in a lifetime I have never had a small engine with to much compression.
50 is the bare min. Note some mowers have compression release.
If you are referring to a riding lawn mower, the manual specifies 12 - 14 psi in each tire.
Depends on the size of the mower.
6,250 J
That will vary for each make and model of mower.
It depends on what kind of lawn mower (push or ride). I sell my fixed push mowers usually for $30.
give up and hire a lawn service...
10 dollar
4 hp
about as much as a lawn mower
Check the oil/fuel mix and make sure you have it mixed to the correct ratio. Else, try raising the blade on the lawn mower. If you have the lawn mower blade too low, mowing tall grass, it can make too much work for the mower and will cause it to overheat.
It depends what kind? The push lawn mower about 70 - 80 pounds. The ones that you ride on, those weigh about 200 - 350 pounds!