My brother works for a major small engine manufacturer. They make all types of engines in the US as well as China.
For the low end engines of nearly any well known manufacturer the name means nothing. They design an engine and then source the parts to meet their needs.
They use what are referred to as commodity parts. No name made by whoever meets their price in whatever country Those parts go into a bin that every engine maker buys parts out of if they meet a spec for one of their models.
Only real difference with off brands or low end models of name brands is engine life. Performance wise nearly every model of similar specs will perform the same. But the low end and off brands have a shorter expected and acceptable life span.
One of the engineering guidelines is motor lasts x number of hours. If lasts considerable longer then they see if cuts can be made, to save money and stay within lifespan guidelines.
