for me, dapat lang na iban ung 2-strokes. even at optimal operation, me sinusunog pa ring oil yan, which goes out the tailpipe, and into your -- or your kids' -- lungs.
medyo ot, but i read some articles on devices that can be retrofitted onto 2-stroke engines to lessen their emissions. a company called Environcycle offers this kit (bolt on lang ata) that can make the combustion more efficient. another involves converting the engine to lpg -- though i'm not really sure if and how these technologies would solve the inherent oil-burning issue.