All of the flaming crap being thrown around reminds me of a section in Max Alth's book _All About Motorcycles_ on two-stroke engines.
In the section where Alth discusses two-strokes (he mentions split-single engines! Hooray for twingles!), he says that two-strokes are both more polluting and more efficient, but that steps are being taken (in 1981, or whenever this was being written) to develop oil-injection systems that squirt oil _directly onto the sides of a moving two-stroke piston_
What happened to that? Alth seems to have believed that this would have made a two-stroke less polluting, but the only oil injection systems I have heard of are like the one on my Express, or the ones on Tomoses that are supposed to vary the amount of oil based on engine rotation speed.
Why no systems that inject oil only into areas with moving parts? It would require that engines be designed for it, but could be worth it for at least those racing engines that need to be light and powerful.
Also, has anyone else read Max Alth? I have _All About Mopeds_ too, and it's so corny I could cry.