I wouldnt put anything lighter than 20w50 in my 2T, or else it tends to leak. Whether or not it's synthetic doesnt really matter, but synthetic is usually of a higher quality than mineral oil.
The jetting for the 2L Escort your carb came from is probably pretty close to the mark, if thats the motor it was previously tuned for. It may be a bit rich as you say. Is it blowing any black smoke? What makes you think its rich?
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