Direct Injection
Direct injection has considerable advantages in two-stroke engines, eliminating some of the waste and pollution caused by carbureted two-strokes where a proportion of the fuel/air mixture entering the cylinder goes directly out, unburned, through the exhaust port. Two systems are in use, low-pressure air-assisted injection, and high pressure injection.
Since the fuel does not pass through the crankcase, a separate source of lubrication is needed.
Read more about this topic: Two-stroke Engine
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