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People take it out to increase the air in the fuel to air ratio. So basically it is done to get "better" performance. If your bike is running fine you probably don't need to do it. It's easy to take out and put back in though so you could take it out, see how the bike runs and put it back in if it has a negative or no effect.
A power commander is for FI systems. The 250r's in the USA have carbs.
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