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^ attempted adjusting of the pilot screws would make sense, no?
You need to verify the carb innards are absolutely correct and assembled correctly for your version 250, nobody been in there "modding"...screwin' around, swappin' stuff at any time....other than Mr and Mrs Keihin, that is.
On BOTH carbs verify the size of pilot jets, main jets, # on needles, visually assure the needle jets are BOTH present in all their shining glory (as these commonly "go missing" and could very well be responsible for transition issues)
Verify the pilot screw springs, washers and orings are present too.
Always remember....Clean Carbs Matter.
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