If you have the time, and your two bikes are the same, you could swap the carbs from bike to bike, coils and so forth until you isolate the offending part. Then you can take corrective action. Be sure if you do this, there are not any gaskets that you might need. I have only seen a 225, so I cant offer much other help other than make sure the tank is venting properly. you could test this buy cracking the pettol tank cap open a bit when you are in the RPM range you're having problems in.
Good Luck, Steve
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