Try dropping the needle (raising the clip) all the way, then stretch the spring a bit. I know it sounds weird, but that's how I fixed the very same iding issue on my 50cc.
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50cc 139QMB, 7g sliders, manual petcock w/ transparent lines, Naraku CDI, Naraku belt, high output racing coil, 18.4mm CVK clone w/ #85 mj and #38 idle, needle @ leanest, OEM pipe mod, Kenda tires, NGK Iridium, lots of LED mods, 2.61L/100km (90 MPG)
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