both are good, but both have weaknesses, i give the 4 stroke to yami, but you CANNOT beat the fuel economy of an opti, if you can prove me wrong. and those who say the optis blow up alot... well that was true at one time, but you yall need to look into how many hpdi blow. but either way the market has come along way for direct injection, the fuel econemy is awesome. but still give me my choice and its a carb 2 stroke, be it yami or merc, but those v-4 yammis are really hard to beat
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