I recently bought an 04 250. Off of craigslist. Has not even 7k in mileage. The guy said the bike was sitting in his garage for two years. A good friend of man had some spare carbs so we switched mine out with his. So here lies the problem. There is old fuel and new fuel that I added in, along with seafoam to help clean it out a bit. My bike is also due for an oilchange just haven't had the time to do it. My bike starts up fine, but it idles at high rpms.The choke has to be fully open for my bike to stay on. I know its a cold starter because its carbourated, but I ride it around a bit to warm it up and sometimes it still idles rough. Occasionally it will die down and stay at out 1300 to 1500. So i'm guessing my carbs need to synched to my engine when we replaced the carbs. That and I should take out the old fuel, and get an oil change. Any advice is greatly appreciated.