Got a few back when my ignition quit, so I don't make the ignitions any longer...I made a deal with Bill at C&H to use his, no more ignition problems...
Got some bent ones back..
I can't remember when one came back with a manufacturing defect, there have been NONE..
Put oil in the fuel and keep the battery charged, they work forever...(well almost
)
Bought a few back from owners who weren't satisfied for some reason, sold them as used engines, no problems.....
The only defect ever was a casting flaw many years ago when the cylinder mold was changed...The casting wall was too thin around the pulse hole and sometimes leaked...All were replaced by ISC International at no cost....
A lifetime guarantee is easy when nothing breaks....