The new generation GX Series, Honda's family of commercial-grade engines, brings improvements in power, fuel efficiency, emissions performance and quiet operation to the already popular engine line. Featuring four all-new models, the large GX engine line combines increased power and versatility with greater fuel economy in the same envelope. The new GX240, GX270, GX340 (pictured) and GX390 engine models are overhead valve (OHV) horizontal shaft engines that offer users durable power for a wide range of demanding commercial, construction and rental applications.