Improvements in mark II: You can turn it off (will go through one more cycle before doing do so). It's more fuel efficient. You can no longer multi-cycle. It turns off on engine explosion or low fuel (it's actually no fuel by the way). More fuel capacity. Less chance of engine explosions when running on nitro than mark I. Will run on gunpowder (you will need to hack the mechanical engine timer to do so). Added emergency fuel.
DO NOT ATTEMPT TO OVER CLOCK TIMER (will result in engine explosion)
features: if engine has an explosion it auto turns off if it is low on fuel it engages emergency fuel while it is refueling itself controls amount of emergency fuel used to preserve it