![]() This is especially evident when revving the engine or placing it under load. A classic symptom of using solid core wires with a Magneto is a jumpy, mis-reading, or erratic pointer. If you are running a Magneto, you MUST make sure that you are using suppression core spark plug wires. If the tachometer is wildly erratic or jumpy all over the scale, it could be due to in-correct installation or because you are running a Magneto type distributor. A fluctuation of this type at low engine speeds is a trade off for an extremely quick and smooth reaction at higher engine RPM (where it really counts!) on these types of ignitions. A little jumpiness at idle is considered normal in this case due to the low frequency signal generated by this ignition signal type at idle. Is your tach pointer jumpy only at idle? This may be due to a 4 cylinder 1 or 2 pulse calibration setting.
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