The CDI unit on my 1985 Yamaha DT 125 appears to be broken. How can I bypass this CDI, since there are no replacement CDIs available?

beleinBybelein

Hello mechanics, the CDI unit on my 1985 Yamaha DT 125 appears to be broken. However, the system ignites sporadically for a few more kilometers. I suspected that temperature plays a role. Anyway, I've now heard that there's a "Bosch Ignition System," which is essentially added to an existing ignition system and triggers the ignition spark sequence via the flywheel, for example, via a contact breaker. Does anyone know anything about this or has ever installed such a system? Thanks for your input. Regards – Belein

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fuji415
fuji415
8 years ago

So what can't be simply replaced by what else should be about the same with the wiring but the rest of it is also soon scrap.

The High-voltage capacitor ignition (CHC), whether or not Thyristor ignition or English Capacitor Discharging Ignition (CDI) is a method of ignition in internal combustion engines in which a capacitor is charged by direct voltage and is suddenly discharged via the primary side of the ignition transformer.

In principle, an HKZ consists of a DC voltage source, as in a simple circuit diagram next to it. U with pre-switching resistor which is connected via the primary side of the ignition transformer L1 the capacitor C inflates.

The DC voltage U in the range from 300 V to 500 V is usually obtained via a DC-DC converter either from a battery, accumulator or an electric generator driven by the internal combustion engine.

The Thyristor Thousand ignited by the control electronics (not shown) via a control pulse, in which case the C stored electrical energy abruptly over the primary side of the ignition transformer L1 .

The ratio of the number of turns of the ignition transformer with the number of turns n1 for L1 and n2 for L2 the voltage pulse is changed by the factor of the voltage ratio ü :

https://de.wikipedia.org/wiki/high voltage capacitorz%C3%BC

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