my 250R won't idle.It also bogs in the mid range up
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Sounds like a carb problem. First dissassemble & clean the carb real good. Pay special attention to the air passages connected to the air screw. Also, while you're in there, write down the sizes of both jets. What position is the needle in (1 thru 5). Can you still contact the previous owner to find out all modifications and aftermarket parts? First thing you need to do is get it to idle, then tweak it from there. If it's a 38 Keihn, the idle stop screw is on the side of the carb as opposed to being incorporated with the choke, like the stock carb was. Also, chekc for intake air leaks - around carb boot, reeds, etc. Spray carb cleaner around the area while someone keeps the engine running. If there is an air leak, the engine will speed up when you spray something flammable in the leak. Good Luck!
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