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Message: [QUOTE="drew9184, post: 1125720, member: 73906"] motometal is right about the jetting being your problem. if it was your cdi your bike wouldnt run or hardly at all and it would only start by dragging it behind a car or running it down a hill. i had the exact problem with my 1992 cr250 you have. i also went for the newer carb one off a 2000 its called the airstryker very good carb lots of people use them on these bikes i dont know why you would have got a 1999 carb when the 2000 cr250s came stock with the best carb you can get in my opinion. just lean your main jet by 1 or 2 jet sizes at a time and keep a close eye on your plug. it cleaned my bike right up. hope you figure it out youve got yourself a sweet bike. the timing is non adjustable dont mess with it youll regret it. could burn a hole in your piston in under a minute. [/QUOTE]