Hi Gael,
I don't know about your bike (it sure makes a change from an XT600!) but there are quite a few technical advice sources, such as:-
XT225 Home 2006
XT225 Serow Riders in the UK/USA
I agree with your basic line of questioning: what has changed, especially recently, that could have caused the fault?
You could try changing things over between the two bikes (this is often quoted as a great reason to travel with 2 or more bikes of the same type). e.g. swop the carbs over and see what happens. If you go down this route, swop one thing at a time and look for the effect!
Also, just have a good look at both of them first, compare, and see if there are any obvious differences, such as a split carb to cyl rubber.
Mid-top end range could be caused by "that part" of the carb which operates at full throttle, depending on the carb type/design (hopefully one of those links has good first hand info).
It could also be an electrical problem, so don't discount anything just yet!
Good luck,
__________________
Dave
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