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94 YZ 125 High rev when cold

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I have a 1994 YZ 125. The engine is in great shape. I think I have tuned it up pretty good. I am new to 2 strokes. When warm the bike runs very smooth with very good throttle response. However when I first start it up it revs up really really high until the engine gets warm. Even when it is warm enough (outside) not to have to use the fuel enriching valve. When I do use that I push it down as fast as possible cause the bike will rev so high so fast. Is this normal? If not what have a done wrong?

Thanks in advance,

Dave

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