I like the idea of using a simple 2 stroke engine as a air or steam engine. I think that a lubrication device would have to be placed in line with the incoming air or steam. But I was thinking that a small air tank, a throttle, and a small 2 stroke attached to a bike would be really nice and have lots of power. It would weigh less than a battery pack and probably get about the same distance, but more power than most electric bikes. Of course, if you use too much power then your air supply won't last very long. And you could recharge the air using a compressor at home or at any gas station. And a full charge could happen in under a minute, while charging batteries can take hours.