The Honda GX35 engine kit is specifically made for installation on a bicycle to make it gas powered. The Honda kits, as well as other gas powered bicycle engine kits, are available from the manufacturers and distributors, as well as on eBay.
Golden Eagle Bike Engines, BikeMotorKit.com and BikeBerry.com have Honda GX35, as well as other models, available for purchase and installation on most bicycle types. The GX35 is a 1.6 horsepower, four-stroke, belt driven engine that requires no oil mixture into the gasoline. The engine's design requires only half of the fuel and oil needed by less efficient two-stroke models.