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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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Doing my part to reduce dependence on OIL
Doing my part to reduce congestion
And enjoying it!
If you have to use your brakes, you are driving too fast!
My 101.5 MPG 2003 Kawasaki Ninja 250
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