Very likely a Chinese engine. Ardisam is a U.S. company with entry level products. Some are good, some not so good.

Finally found it. Made in China.

Here is a link that might be useful: 43cc viper

"Warning: don't buy a Viper--they strike hard and bite! "
Rusty- you crack me up sometimes!!

The viper 150 cc motor comes with a Standard 5 year warranty unlike Briggs & Stratton a 2 year Standard warranty I was told by many the viper 4 stoke motors are some of the very best built today for Mowers earthquake Mowers have them.heavy duty and reliable the body on the Earthquake Mowers 150 cc are rust proof 12 gauge steel a top mower for sure I'll get many years of use mine is a walk behind 150 cc designed to take down grass and brush up to 4 feet high