[SigmundA]

Direct injection two-strokes like ETEC's avoid the burnt fuel in the exhaust by not injecting any fuel until the exhaust port is closed. They also typically have specific oil injection points reduce the amount of oil needed to be burned. They are generally as clean as modern 4-stroke engine.

[TimBurr]

Thanks for the reference! I'll have to read about those more.

Sounds like that also eliminates any fuss with oil/fuel ratios, since they're introduced separately.