Scooterotica

Hope someone can help , got a acewell speedo / tach on my rb20 ,the rpm sits fine at around 4000 to 5000 then jumps up to 19999 rpm , got a resistor plug in and the in line resister in the wire on the ht lead ,any ideas ?

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Never had a problem with mine,the pick up wire is twisted around the HT about 8 to10 times and covered with heatshrink.Google Quadtech to ask their opinion if you can't get it sorted.