As shown in the picture, you cannot lower your fuel tank enough to have that engine run properly as mounted unless you use a device that will decouple your engine's carb from tank height issues. These devices are known as fuel pressure regulators and are sold by Cline and Iron Bay. They require that you pressurize your fuel tank with either crankcase pressure using a check valve and a crankcase tap (preferred), or muffler pressure using a check valve (not the best for a two-stroke engine). Bite the bullet and buy one of these two regulators and install it. Otherwise your experience will be one of misery. Do NOT buy the Perry pump in their place - just more miserable experiences.