All Sales are final, in the case that a return is approved for any one scenario items must be sealed in original packaging as received. Engines come with a warranty provided by the original manufacture covering defects. The customer is responsible for the sole maintenance of their engines. For longevity of your engines life we highly insist using "After Run Oil", "Engine Maintenance" after burning out all fuel residue from the engines internal components. Always leave the engine with oil in it when storing.