Don't machine the wheels. Don't worry about weight. The small amount you'll lose even with expensive Marchesini's won't do much for you. They won't keep with Ninja 300's or KTM 390's or Yamaha R3's no matter what you do. Those have at least 10 HP on the Ninja 250. You can keep up in the corners but will get dogged in the straights.
Instead, get good tires, good suspension and then focus on rider skills. Don't race to win, race to have fun and learn! Race the lap timer.
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Goin' fast on slow bikes!
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