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Hall Sensors dying on Holt 75

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michelko:
Hi Guys,
since i got my Holt running it worked real nice with that cheap chinese CDI Ignition.
But since a couple of days the hall sensor going mad.
I changed 7 or 8 times but the engine will only run a couple of seconds to a couple of minutes fine and suddenly stops.
And another hall sensor is fried. I changed the holder of the Hall sensor from bras to delrin, helped not. Changed to another CDI, same symptoms.
Has anyone a good idea whre to look?
I am a little frustrated now.

Regards Michael

michelko:
https://www.stirlingkit.com/products/ignition-starter-kit-for-horizontal-combustion-engine-hit-miss-gas-model
this is the first ignition i used with succes for some time.

https://mbi-design.de/wp/produkt/cdi-zuendung-a-01/
that is the second one i testet with the same results.

michelko:
The Sensor is an Infineon TL 4905l

Jo:
Have you measured the voltage coming out of the ignition going to the hall sensor?

Jo

gbritnell:
In all my years of using Hall sensors I have only had two burn out, that is until my flathead engine. I must have gone through five with it. I ultimately traced it to my Hall lead to wire connection.  It was too close to the metal holder and one day I could see an arc jumping to ground. Make sure that you have a good path back to the negative battery connection and that all ground connections are good.

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