Not sure if this has been done before or is posted elsewhere.
There are multiple windscreens made specifically for the gw250. They probably work great, but I am a cheap bastard and wanted an adjustable option. The solution I found also allows me to mount a GPS, so I am happy with it. 750 miles at all speeds and no issues so far…
I went to the hardware store and purchased 2 x “1/2 inch drop in masonry anchors” (see picture), bolts of different lengths and some extra nuts. I was out the door for less than $8.
The bottom of these anchors expand as the bolt is tightened. The inside diameter of the handle bar pipe is slightly larger than the outside diameter of the anchors I purchased (measure with a caliper ahead of time).
As for the nuts (and head of the bolt), there are 6 corners and 6 flats. The corners are almost 7/8” apart. 7/8” is a common handle bar diameter. By adding an extra nut to the bolt, you can create 12 points of contact for of the windscreen clamps to grab. If you want to add more handle bar accessories, just get longer bolts and more nuts.
Installation is simple. Make sure all the extra nuts are tight on the bolts. Remove the rubber caps on the inside of the bars. Slide the anchors in. Use pliers to hold the anchors and a socket wrench to expand it.
Now you have room on the “handle bars” to mount stuff.