now days with the 4 strokes they have two different models that you can buy. theres the crf450r motocross bike. you can also buy the crf450x that bike has electric start a headlight and a taillight and a motor that is detuned a little bit so its a little easer to trail ride.here is no difference it's the same bike. There never has been a non-race version of the CR250. It's just when some people say or write the model name they sometimes just drop the R since everyone that knows bikes knows what they mean.
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