Ive blown a hole in a piston, cracked rings, and only had smoke, no
grinding, no noise . No one can say how much to repair as even you
dont know the problem or extent of damage. Or extent of debris in the
This type of damage comes from wear, wear from not maintaining the
mower with good oil or overworking it. Is it a temsumseh, they are the
bottom of the barrel, rarely worth rebuilding.
Valves dont take the brunt of wear on Temsumeh or in a load up.
They have crap bearing and oiling design.
Sears has honda powered mowers now, cheap. go get a 20 yr honda , use
better oil, change your oil more often and dont beat yor machine and
expect it to last.