My upper fairing stay is broken

From Ninja250Wiki

No surprise there. The upper fairing stay is one of the first things that can get bent on the EX250, and they are hard to find used for a decent price in "untweaked" form. We recommend trying to fix the one you have, if you have any welding skills (or a welder-wielding friend), especially since it costs $135 new. And when you fix it, make it beefier.

Part # 11046-1289; third owner, 16,000 miles

The bottom part of the bracket (stay) was designed for obsolescence. Bring the pieces to anyone that has a welder and have a new piece welded to the bottom of the strut. Either 3/4" or 1" flat steel strap can be bent, drilled, and then welded into place. The strap will have a lot more strength than the lightweight piece that Kawasaki uses. It will weigh a few grams more, but it won't break again.

It can also be done without a welder -- use a long bolt through the strut to hold the new bracket into place. You may need to trim the bottom of the strut if you use the bolt; there isn't a lot of clearance where the bolt head goes.

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