a two-cycle engine derives all of its lubrication from the pre-mix oil that is mixed with the gasoline. this is done either in the raw fuel or via an oil injection system. if you have an oil injection system there is nothing wrong with putting straight gas into the tank as long as the oil reservoir contains a lubricant designed for an oil injection system. however if you do not have a oil injection system putting straight gasoline into the engine will more than likey cause the engine to lose lubrication and either rapidly wear down any internal components or in the worst case seize the engine solid