running 20/66+ at three sisters in a pro kart you are going to get creamed down the back straight. The front runners will all be on 22/66 and i still usually pull at 5800 revs. Ys you are going to get some more pull out of the corners but the real issue is your weight. You are giving away 15kgs and you are never going to make this up with gearing as you are always compromising your straight line speed. Firstly shed some weight, sounds harsh but its the only way its going to work, otherwise you will just have to accept you are going to be slower, and try to improve your driving and find your level. Even with your weight though i wouldn't gear any lower than 20/66
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