Pertronex ignitor and coil problem

Posted February 14, 201312 yr

installed new Pertronex ignitor and coil in 1971 240 works great but, tach drops off at 4000 rpm when engine revs higher. Jumps up to 4000 rpm when revs drop below 4000. do I need another resistor and where do I get it?

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February 14, 201312 yr

comment_415004

I have a '72 with a Pertronix & it works great, no tach issues. Check out http://www.zhome.com/ZCMnL/tech/ZXPertronix.htm & make sure you follow their wiring diagram.

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February 14, 201312 yr

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comment_415016

Thanks Dave, I`ll check my wiring....

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February 21, 201312 yr

comment_415720

Did you eliminate the ballast resistor? I have to check mine, but I think even if you go with a 3 Ohm coil, you need it for the tach. Correct me if I get this wrong.