At the SuperNationals I attempted to push-start a kart with a failed piston ring, ended up pushing it the entire length of the grid through a cloud of Aspen/Elf exhaust smoke, and it never ran. I ended up coughing for about 15 minutes afterwards. Has anyone run one of the IAME engines on a dyno with an emissions probe? Is there something especially nasty in either that fuel or that oil that would be toxic to inhale?