A display apparatus may include a multi-state IMOD, such as an analog IMOD, a 3-state IMOD or a 5-state IMOD. The pre-lubrication system is structured to constantly maintain an acceptable supply of oil within the reservoir and will supply pre-lubricating oil upon a burst of air being initiated and directed into the oil reservoir, through an air flow corridor, so as to displace oil contained in the reservoir out through the oil flow corridor for pre-lubrication of the engine. The two sprockets engage with the chain.