[feet]

I'm willing to bet that computer controlled fuel injection wouldn't solve the issue. It may lower emissions slightly but two strokes still require lubricant to be mixed with the fuel, I'd bet my hat that's where the high VOC emission is really coming from. They're constantly burning oil, literally.

[bradfa]

The oil is injected separately from the gas. So only as much oil as is needed for the engine load and speed is injected, which allows varying the oil mix as low as even below 100:1 compared to normal pre-mix concentrations of 40:1 or 50:1. So the amount of oil burned is significantly less on the injected 2-strokes as it’s only injecting what the engine needs for lubricity and nothing more.

[feet]

That's interesting, I wasn't aware they get injected separately. While this would decrease VOC emission greatly, I can still see these engine designs being higher emission than a comparable four stroke although I may be wrong. I'm not a mechanical engineer.

My reasoning is that oil still gets burned, likely at a higher rate than any oil that gets through on the four stroke. It would be interesting to see if two strokes could be redesigned to place the oil outside of the combustion chamber, I think that would be a serious game changer for ICEs.

That being said, I'm definitely an advocate for moving away from combustion altogether.