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    Re jet? Or new cdi? Or exhaust?

    Okay so ive learned a lot about the motors but still can't quite get the tuning down. So I have standard Chinese 68cc on a 90's road master. I have performance carb with size 66 jet installed, when I bought the carb I also bought sizes #66 #67 #68 #69 #70. My question is in regards to...