HKS Co., Ltd. is a publicly traded company headquartered in Fujinomiya, Shizuoka Prefecture, Japan specializing in the engineering, manufacturing, and sales of high performance aftermarket and accessory automotive parts and components. With 50 years in business, and global efforts in aftermarket parts and motorsport, the company claims, "HKS is perhaps the most known aftermarket brand in the world".

The HKS 700E is a twin-cylinder, horizontally opposed, four stroke, carburetted aircraft engine, designed for use on ultralight aircraft, powered parachutes and ultralight trikes. The engine is manufactured by HKS, a Japanese company noted for its automotive racing engines.