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Thats a superjet dry pipe. The smoking down low rpm is normal. Its because the same amount of oil is being burnt at low rpm as high rpm because of pre mix. the only way to fix it is to install a variable oil pump which injects more oil as you squeeze the throttle. But you should just leave it and maybe run about 40:1 oil ratio. Are you running 1.5 needle and seats??
 

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Yeah it is a good pipe. It was designed for surf riding and has a lot of bottom end. If you lean off the low speed mixture screws or jets, its ok as long as it doesn't die upon acceleration meaning lean. Its something you have to tune. Is the oil your using a TC-W3. Make sure it is and not a synthetic or caster oil as these will make more smoke.
 
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