2003 kx250 carb issues

Have v-force reeds, pro-cricuit works and 304 shorty on bike, messed with air screw alittle bit and went to track and my bike sounds like a cobra 50, all gears are extremely short, I know I need to buy jets, can someone help point me in the right direction of what size jets I need to get? And am I only replaceing mainjet?

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