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120psi since both are the same is doubtful of being the problem, if one were 60 and the other 140 then I'd say differently. With that said, I would try a little spray of starting fluid and or choking the carb to see if that allows it to start better, possibly too much fuel, not enough fuel or excess air/leak which could be base gasket, carb gasket, intake gasket, etc. Also check spark and make sure spark is strong not weak and no misfires.
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