Collection: Duromax 500 / Rato R500-V

These parts are for the Rato R500-V engine, which is commonly known as the Duromax 500. Think "son of GX390" with extra beefy castings that support a 94mm bore and a 72mm stroke right out of the box. Thicker and heavier in every dimension, this engine has TONS of potential with a great cylinder head that rocks a 40mm intake valve!