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When my air gate adjuster is like in the middle like half way down, my initial acceleration is fairly quick but it makes that weird farting noise when i get past 20. Then if i keep the air gate adjuster ALL the way down to open, it goes very slow. Right at 15, it feels like it just boosts and takes off and then i can go to at least 25 without the fart can sound (i haven't tried 30 yet, i need the engine to break in). What is the cause of this? I don't know where to leave the air gate adjuster because up the bike doesnt go, in the middle, it goes but farts past 20, and all the way down very slow until 15 mph then takes off. What shoudl i do!? 