well, your metro engine is going to be turning alot slower, so carbs from a smaller engine should work, but then you are going to need new jets to make up for the change in air velocity, I don't have a copy of any intake and exhaust books in front of me any more but there are definent formulas to make this work, another option would be to get multi throttle bodies, there are a number of motorcycles that have fuel injection like that.
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