I have a 12.5 HP 38" Yard Machine that stops when hot?

Before u do,go to an electriclal componant supplier,radio shack or maplins,and buy a can of freez spray.this stuff will freeze componants so much the have frost on them.Trade use it for finding electrical componant heat related opon circuits.Blast the coil with it and see if it'll start.Great stuff,cost's less than a couple of beer's.But your problem could be:valves too tight,cracked cyl head,carb to head gasket.blocked air filter.partial siezure.or any combination.Buy a cheap compression tester and check reading's when cold and when hot.

caine
August 2008