Many people go to 130/90-16's on the 1st-gens, as that size makes some much nicer tires available than the stock 130/80-16's. The 90 profile makes for a taller tire, which does slightly raise ride height & seat height, but it's minor.
Most people advise against going wider on the stock rims. The ninjette's rim sizes have stayed the same for a million years. When it first came out, the stock rear tire was actually a 120 width tire. Once 120's became hard to come by, Kawi started shipping them with 130's, but that is already wider than the original rim width was chosen for. I wouldn't go to a 140 on the rear of a 1st-gen with the stock rims; if you really want a wider tire and want to take advantage of some of the potential benefits of that tire, you need to change out the wheels as well.
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