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Hard Starting

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I recently bought my son a clean 2007 cr125r. Today was the first day we really had a chance to ride it. It started ok when cold, but when warm it can take about 100 kicks to fire back up. It has a oversized top end (138cc). The previous owner had the idle screw backed way out so it woudn't idle. (he said that by doing this, it would make more power). Don't care too much for the extra power but would really like it to idle. I adjusted the screw in so it would idle but it will only idle really high or not at all. Something seems to be out of whack. I have been told that jetting these things correctly is difficult. Any advice will be appreciated. thanks

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