<VV> Jumping Tach Needle

Tom Hughes corvairdad at gmail.com
Wed Jun 3 17:59:34 EDT 2015

I've discovered my pertronix has gone bad so I've reinstalled the points
plate and stock coil . Now, while accelerating, the tach needle jumps up a
few hundred rpm and then quickly  falls back. Happens quite frequently.
There appears to be a slight miss when it does this. Could fouled spark
plugs cause this? How about a poorly grounded  points plate? Missing
condenser on the stock coil? What else should I check?

Much thanks in advance.


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