Who makes DuroStar generator engines?

DuroStar generator engines are designed and specified by DuroMax Power Equipment, the California-based parent company behind both the DuroStar and DuroMax brands, and manufactured in China to those specifications.

DuroMax Power Equipment was founded in Ontario, California in 2003 and controls the engineering specs for the OHV engines used across the DuroStar lineup. These are 4-stroke overhead valve engines — not sourced from a third-party engine brand like Briggs & Stratton or Honda — built to DuroMax's own design, featuring cast iron cylinder sleeves on higher-output models and running at 3,600 RPM under load. The same engine architecture appears in both DuroStar and DuroMax branded generators.

• DuroStar engines are built under DuroMax Power Equipment, founded in Ontario, California in 2003.
• DuroStar generator engines are 4-stroke OHV (overhead valve) designs, not third-party branded engines.
• Higher-output DuroStar engines include cast iron cylinder sleeves — for example, the DS13000MX uses a 500cc OHV engine with a cast iron sleeve.
• DuroStar and DuroMax generators share the same engine architecture; differences between the two brands are primarily cosmetic.
• DuroStar engines are manufactured in China; design and product development are US-based under DuroMax Power Equipment.