At small throttle opening, BSFC and BSHC are decreased compared to the carbureted engine, but the values are still higher comparing to those of four-stroke engine.

• 小节气门开度时，通过推迟喷油可以实现分层燃烧，BSFC和BSHC也比原机有所下降，但仍比四冲程发动机高很多；