Let me first ask you what buggy you have. Sprocket changes do not create more power. All you do with sprocket changes is move your power curve. The buggies come set up from factory for all around performance. Larger axle sprocket or smaller output sprocket will increase low end torque. Going the opposite way will give more top end torque. So no matter which you go you will improve on one end but suffer on the other.These motors were designed for scooters of less then half the weight pushing one wheel and driving one wheel. The only way to make more power is to build the engine to take in more fuel and air and efficiently burn it. The average naturally asperated engine only fills 65% of the cylinder with A/F mixture weather it be a car or ATV or Cycle. To make more power you need to mod the engine to efficiently bring in more A/F above the 65% volume. Now as for the sprocket , a 520 and 530 sprocket or chain has both different width and pitch. Yes you can mix the 2 but you will be constantly changing sprockets and chain on a frequent basis.
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