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I'd have to agree with janvos.... for a 90cc cylinder, the primary should have an inside diameter of no more than 1" in my opinion.
The Stock Ninja 250 headers have an "H" pipe crossover about a 6-8 inches out of the head, FWIW. The 87-07 Ninja 250 have a dual exhaust and didn't merge into one. Most aftermarket exhausts for the bike have a 2-into-1 design. The 08-present Ninja 250's have a 2-into-1 design in stock form.
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