Either it is a 2 stroke(in which it's normal), or if it's a 4 stroke it has worn rings and is burning oil
Buy a lawn mower engine repair manual at Border's or Barnes & Noble.
its probably burning oil, if the smoke is white. if the smoke is black, it means its running rich. if the smoke is white, you have serious internal engine problems
It is need of a service.
its burning oil :(
One reason that a lawn mower may begin to smoke is that the oil chamber is too full. Spark plugs that have burnt oil and are not cleaned can create smoke and other exhaust issues.
very gently, or the mower will get squashed
depends on the engine but it will be on the engine block.
You will do serious damage to any 4 engine that you overfill. Drain out the excess oil immediately.
The sound of a jet engine vibrates more than the sound of a lawn mower.
on a racing lawn mower it would be good, just rev up your engine and will engage.
from a distance away why does a jet sound loader than a lawn mower
Oil burning