the "Y" in YN57 represents it has a Y series motor -
in the states it would've been called an RN55 or Rn57 or something...
firstly, youd have to find a RN series xmember - i dunno if an Rn85 is the same...and i do think it would need to be engineered as you're going 400cc larger with more power - the last thing you want is to run up the ass off a brand new merc and you'd be paying it off the rest of your life as insurance wouldnt cover you.
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